diff --git a/lib/i18n/browser.ts b/lib/i18n/browser.ts
new file mode 100644
index 0000000..8de6e8f
--- /dev/null
+++ b/lib/i18n/browser.ts
@@ -0,0 +1,10 @@
+import { toIntlLocale } from "./format";
+
+export function getDocumentLocale(): string {
+  if (typeof document === "undefined") return "tr";
+  return document.documentElement.lang || "tr";
+}
+
+export function getDocumentIntlLocale(): string {
+  return toIntlLocale(getDocumentLocale());
+}
diff --git a/lib/i18n/catalog.ts b/lib/i18n/catalog.ts
new file mode 100644
index 0000000..02bcebb
--- /dev/null
+++ b/lib/i18n/catalog.ts
@@ -0,0 +1,53 @@
+import { enCatalog } from "../../locales/en";
+import { trCatalog } from "../../locales/tr";
+import type { I18nNamespace, TranslationCatalog } from "./types";
+
+export const DEFAULT_LOCALE = "tr";
+export const BUILT_IN_LOCALES = ["tr", "en"] as const;
+
+export const BUILT_IN_CATALOGS: Record<string, TranslationCatalog> = {
+  tr: trCatalog,
+  en: enCatalog,
+};
+
+export function getBuiltInCatalog(locale: string): TranslationCatalog | null {
+  return BUILT_IN_CATALOGS[locale] ?? null;
+}
+
+export function pickNamespaces(
+  catalog: TranslationCatalog,
+  namespaces: readonly I18nNamespace[],
+): Partial<TranslationCatalog> {
+  return Object.fromEntries(
+    namespaces.map((namespace) => [namespace, catalog[namespace] ?? {}]),
+  ) as Partial<TranslationCatalog>;
+}
+
+export function flattenCatalog(
+  catalog: Partial<TranslationCatalog>,
+  namespaces: readonly I18nNamespace[],
+): Record<string, string> {
+  const entries: Record<string, string> = {};
+
+  for (const namespace of namespaces) {
+    const namespaceCatalog = catalog[namespace] ?? {};
+    for (const [key, value] of Object.entries(namespaceCatalog)) {
+      entries[`${namespace}.${key}`] = value;
+    }
+  }
+
+  return entries;
+}
+
+export function compareCatalogKeys(
+  left: TranslationCatalog,
+  right: TranslationCatalog,
+  namespaces: readonly I18nNamespace[],
+): { missingInLeft: string[]; missingInRight: string[] } {
+  const leftKeys = new Set(Object.keys(flattenCatalog(left, namespaces)));
+  const rightKeys = new Set(Object.keys(flattenCatalog(right, namespaces)));
+  return {
+    missingInLeft: [...rightKeys].filter((key) => !leftKeys.has(key)).sort(),
+    missingInRight: [...leftKeys].filter((key) => !rightKeys.has(key)).sort(),
+  };
+}
diff --git a/lib/i18n/content.ts b/lib/i18n/content.ts
new file mode 100644
index 0000000..5035eef
--- /dev/null
+++ b/lib/i18n/content.ts
@@ -0,0 +1,50 @@
+export type ContentTranslationFieldKind = "text" | "textarea";
+export type ContentTranslationEntityType =
+  | "branding"
+  | "calendar_event"
+  | "client"
+  | "planning_section"
+  | "project"
+  | "task";
+
+export type ContentTranslationField = {
+  name: string;
+  label: string;
+  kind?: ContentTranslationFieldKind;
+  required?: boolean;
+  maxLength?: number;
+  placeholder?: string;
+};
+
+export type ContentTranslationInput = Record<string, Record<string, string | null>>;
+
+export const contentTranslationRegistry = {
+  project: [
+    { name: "name", label: "Proje adı", required: true, maxLength: 200, placeholder: "Örn. Marka web sitesi" },
+    { name: "description", label: "Açıklama", kind: "textarea", maxLength: 20_000, placeholder: "Kapsam, hedef veya teslimat notları..." },
+    { name: "coverImageAlt", label: "Görsel alt metni", maxLength: 500, placeholder: "Görseli kısaca açıkla" },
+  ],
+  planning_section: [
+    { name: "title", label: "Başlık", required: true, maxLength: 300, placeholder: "Örn. Başarı kriterleri" },
+    { name: "content", label: "İçerik", kind: "textarea", maxLength: 50_000, placeholder: "Kısa notlar, kriterler, renkler, tipografi kararları..." },
+  ],
+  task: [
+    { name: "title", label: "Başlık", required: true, maxLength: 300, placeholder: "Örn. Ana sayfa wireframe revizyonu" },
+    { name: "description", label: "Açıklama", kind: "textarea", maxLength: 20_000, placeholder: "Kapsam, not veya teslim kriterleri..." },
+  ],
+  branding: [
+    { name: "portalWelcome", label: "Portal karşılama metni", kind: "textarea", maxLength: 10_000 },
+    { name: "portalFooter", label: "Portal footer metni", kind: "textarea", maxLength: 5_000 },
+  ],
+  calendar_event: [
+    { name: "title", label: "Başlık", required: true, maxLength: 300 },
+    { name: "description", label: "Açıklama", kind: "textarea", maxLength: 20_000 },
+  ],
+  client: [
+    { name: "notes", label: "Notlar", kind: "textarea", maxLength: 10_000 },
+  ],
+} satisfies Record<ContentTranslationEntityType, ContentTranslationField[]>;
+
+export function contentInputName(locale: string, field: string) {
+  return `i18n.${locale}.${field}`;
+}
diff --git a/lib/i18n/date-fns.ts b/lib/i18n/date-fns.ts
new file mode 100644
index 0000000..8872b17
--- /dev/null
+++ b/lib/i18n/date-fns.ts
@@ -0,0 +1,13 @@
+import { enUS, fr, tr } from "date-fns/locale";
+
+export function getDateFnsLocale(locale: string) {
+  const normalized = locale.split("-")[0];
+  if (normalized === "tr") return tr;
+  if (normalized === "fr") return fr;
+  return enUS;
+}
+
+export function getDocumentDateFnsLocale() {
+  if (typeof document === "undefined") return tr;
+  return getDateFnsLocale(document.documentElement.lang || "tr");
+}
diff --git a/lib/i18n/format.ts b/lib/i18n/format.ts
new file mode 100644
index 0000000..df023e6
--- /dev/null
+++ b/lib/i18n/format.ts
@@ -0,0 +1,72 @@
+import type { TranslationValues } from "./types";
+
+const PLURAL_PATTERN = /\{(\w+),\s*plural,\s*one\s*\{([^{}]*)\}\s*other\s*\{([^{}]*)\}\s*\}/g;
+const VALUE_PATTERN = /\{(\w+)\}/g;
+
+export function interpolateMessage(
+  message: string,
+  values: TranslationValues = {},
+  locale = "tr",
+): string {
+  const pluralized = message.replace(
+    PLURAL_PATTERN,
+    (_match, key: string, one: string, other: string) => {
+      const count = Number(values[key] ?? 0);
+      const category = new Intl.PluralRules(toIntlLocale(locale)).select(count);
+      const template = category === "one" ? one : other;
+      return template.replaceAll("#", String(count));
+    },
+  );
+
+  return pluralized.replace(VALUE_PATTERN, (_match, key: string) => {
+    const value = values[key];
+    if (value === null || value === undefined) return "";
+    if (value instanceof Date) return formatDate(value, locale);
+    return String(value);
+  });
+}
+
+export function formatDate(
+  value: Date | string | number,
+  locale: string,
+  options: Intl.DateTimeFormatOptions = { day: "2-digit", month: "long", year: "numeric" },
+): string {
+  return new Intl.DateTimeFormat(toIntlLocale(locale), options).format(new Date(value));
+}
+
+export function formatDateTime(
+  value: Date | string | number,
+  locale: string,
+  options: Intl.DateTimeFormatOptions = {
+    day: "2-digit",
+    month: "long",
+    year: "numeric",
+    hour: "2-digit",
+    minute: "2-digit",
+  },
+): string {
+  return new Intl.DateTimeFormat(toIntlLocale(locale), options).format(new Date(value));
+}
+
+export function formatNumber(
+  value: number,
+  locale: string,
+  options?: Intl.NumberFormatOptions,
+): string {
+  return new Intl.NumberFormat(toIntlLocale(locale), options).format(value);
+}
+
+export function formatMoney(
+  amountMinor: number,
+  currency: string,
+  locale: string,
+): string {
+  return new Intl.NumberFormat(toIntlLocale(locale), {
+    style: "currency",
+    currency,
+  }).format(amountMinor / 100);
+}
+
+export function toIntlLocale(locale: string): string {
+  return locale === "tr" ? "tr-TR" : locale === "en" ? "en-US" : locale;
+}
diff --git a/lib/i18n/index.ts b/lib/i18n/index.ts
new file mode 100644
index 0000000..c656bc8
--- /dev/null
+++ b/lib/i18n/index.ts
@@ -0,0 +1,4 @@
+export * from "./catalog";
+export * from "./format";
+export * from "./translator";
+export * from "./types";
diff --git a/lib/i18n/translator.ts b/lib/i18n/translator.ts
new file mode 100644
index 0000000..e1c0674
--- /dev/null
+++ b/lib/i18n/translator.ts
@@ -0,0 +1,22 @@
+import { interpolateMessage } from "./format";
+import type { TranslationValues } from "./types";
+
+export type Translator = {
+  locale: string;
+  messages: Record<string, string>;
+  t: (key: string, values?: TranslationValues) => string;
+};
+
+export function createTranslatorFromMessages(
+  locale: string,
+  messages: Record<string, string>,
+): Translator {
+  return {
+    locale,
+    messages,
+    t(key, values) {
+      const message = messages[key] ?? key;
+      return interpolateMessage(message, values, locale);
+    },
+  };
+}
diff --git a/lib/i18n/types.ts b/lib/i18n/types.ts
new file mode 100644
index 0000000..4a9544c
--- /dev/null
+++ b/lib/i18n/types.ts
@@ -0,0 +1,34 @@
+export const I18N_NAMESPACES = [
+  "common",
+  "auth",
+  "navigation",
+  "dashboard",
+  "clients",
+  "projects",
+  "tasks",
+  "calendar",
+  "finance",
+  "journal",
+  "chat",
+  "settings",
+  "portal",
+  "status",
+  "validation",
+  "api",
+] as const;
+
+export type I18nNamespace = (typeof I18N_NAMESPACES)[number];
+export type LocaleCode = string;
+export type TextDirection = "ltr" | "rtl";
+export type TranslationValues = Record<string, string | number | boolean | Date | null | undefined>;
+export type TranslationCatalog = Record<I18nNamespace, Record<string, string>>;
+
+export type LocaleDescriptor = {
+  code: LocaleCode;
+  name: string;
+  nativeName: string;
+  status: "draft" | "active" | "archived" | "test";
+  fallbackLocale: LocaleCode | null;
+  textDirection: TextDirection;
+  builtIn: boolean;
+};
diff --git a/locales/en/common.ts b/locales/en/common.ts
new file mode 100644
index 0000000..1cc9ae1
--- /dev/null
+++ b/locales/en/common.ts
@@ -0,0 +1,15 @@
+export const common = {
+  "actions.save": "Save",
+  "actions.cancel": "Cancel",
+  "actions.delete": "Delete",
+  "actions.edit": "Edit",
+  "actions.create": "Create",
+  "actions.close": "Close",
+  "actions.search": "Search",
+  "states.loading": "Loading...",
+  "states.empty": "No records yet.",
+  "states.error": "Something went wrong.",
+  "pagination.previous": "Previous",
+  "pagination.next": "Next",
+  "plural.item": "{count, plural, one {# item} other {# items}}",
+};
diff --git a/locales/en/index.ts b/locales/en/index.ts
new file mode 100644
index 0000000..6d56e31
--- /dev/null
+++ b/locales/en/index.ts
@@ -0,0 +1,244 @@
+import type { TranslationCatalog } from "@/lib/i18n/types";
+import { common } from "./common";
+
+export const enCatalog = {
+  common: {
+    ...common,
+    "notFound.title": "Page not found",
+    "notFound.description": "The page you are looking for may have moved, been deleted or never existed.",
+    "notFound.backHome": "Go home",
+    "error.title": "Something went wrong",
+    "error.description": "An unexpected error occurred. Please try again.",
+    "error.retry": "Try again",
+    "maintenance.title": "Maintenance mode",
+    "maintenance.description": "This workspace is briefly under maintenance. Please try again soon.",
+    "itemsCount": "{count, plural, one {# item} other {# items}}",
+  },
+  auth: {
+    "login.title": "Sign in",
+    "login.description": "Sign in to access your Neta workspace.",
+    "login.email": "Email",
+    "login.emailPlaceholder": "example@mail.com",
+    "login.password": "Password",
+    "login.forgotPassword": "Forgot password",
+    "login.submit": "Sign in",
+    "login.pending": "Signing in...",
+    "login.setupPrompt": "Haven't completed first setup?",
+    "login.createAdmin": "Create admin account",
+    "register.title": "Create admin account",
+    "register.firstAdminTitle": "Create the first admin account",
+    "register.description": "Create the first admin account for this Neta workspace.",
+    "register.submit": "Create admin account",
+    "register.pending": "Creating...",
+    "register.hasAccount": "Already have an account?",
+    "register.closed": "Registration is closed. The first admin account has already been created for this Neta instance.",
+    "register.failed": "Could not create user.",
+    "forgot.title": "Password reset",
+    "forgot.description": "This flow becomes active when an email provider is connected in self-hosted deployments.",
+    "forgot.helper": "For now, set a new password from the admin side or manage the user directly in the database.",
+    "forgot.back": "Back to sign in",
+    "reset.title": "Set a new password",
+    "reset.description": "Password reset link integration has not been configured yet.",
+    "invite.title": "Accept portal invitation",
+    "invite.description": "Set your name and password for the invited account.",
+    "invite.email": "Email",
+    "invite.displayName": "Full name",
+    "invite.password": "Password",
+    "invite.passwordHelp": "Use at least 8 characters.",
+    "invite.submit": "Create portal account",
+    "invite.pending": "Creating account...",
+    "invite.backToLogin": "Back to sign in",
+    "invite.expired": "This invitation has expired. Ask the freelancer for a new link.",
+    "invite.accepted": "This invitation was already used. You can sign in with your account.",
+    "invite.revoked": "This invitation was revoked. Ask the freelancer for a new link.",
+    "invite.success": "Your portal account has been created. You can sign in now.",
+    "language": "Language",
+    "marketing.headline": "Manage freelance work, clients and finance in one place.",
+    "marketing.description": "{app} is designed to help you track daily operations, projects, side projects and core finance with simple reports.",
+    "marketing.openSource": "Open source and self-hostable.",
+    "marketing.github": "GitHub",
+    "marketing.via": "is where you can find it.",
+    "marketing.builtBy": "built by",
+    "highlights.clients": "Clients",
+    "highlights.calendar": "Calendar",
+    "highlights.finance": "Finance",
+    "highlights.reports": "Reports",
+    "messages.invalidCredentials": "Email or password is incorrect.",
+    "messages.setupUnavailable": "Registration is closed. The first freelancer account has already been created for this Neta instance.",
+    "messages.setupStateError": "Could not read setup state.",
+    "messages.signupFailed": "Could not create user.",
+    "messages.portalInviteFailed": "Could not create portal account.",
+  },
+  navigation: {
+    "groups.overview": "OVERVIEW",
+    "groups.operations": "OPERATIONS",
+    "groups.personal": "PERSONAL",
+    "groups.ai": "AI ASSISTANT",
+    "groups.processes": "PROCESSES",
+    "items.dashboard": "Dashboard",
+    "items.calendar": "Calendar",
+    "items.analytics": "Analytics",
+    "items.clients": "Clients",
+    "items.projects": "Projects",
+    "items.tasks": "Tasks",
+    "items.finance": "Finance",
+    "items.journal": "Journal",
+    "items.chat": "Chat",
+    "items.settings": "Settings",
+    "items.portalProjects": "Your projects",
+    "items.portalTasks": "Completed tasks",
+    "items.portalRevisions": "Revision requests",
+    "shell.skipToContent": "Skip to main content",
+    "shell.homeAriaLabel": "{app} home",
+    "shell.mobileMenuAriaLabel": "Open or close main menu",
+    "shell.mobileMenuTooltip": "Menu",
+    "shell.logoAlt": "{app} logo",
+    "shell.progressTitle": "Project progress",
+    "shell.progressValue": "{progress}% complete",
+    "shell.progressAriaLabel": "Project progress",
+    "shell.accountMenuAriaLabel": "Open account menu for {name}",
+    "account.signOut": "Sign out",
+    "account.signingOut": "Signing out",
+    "account.signOutError": "Could not sign out. Please try again.",
+  },
+  dashboard: {
+    "title": "Dashboard",
+    "description": "Track your work performance, revenue and daily status.",
+    "stats.netEarnings": "Net earnings",
+    "stats.activeProjects": "Active projects",
+    "stats.completedTasks": "Completed tasks",
+    "stats.averageMood": "Average mood",
+    "sections.financeSummary": "Income / expense summary",
+    "sections.moodTrend": "Mood & energy trend",
+    "sections.recentProjects": "Recent projects",
+    "sections.recentClients": "Recent clients",
+    "empty.finance": "No financial data in this date range.",
+    "empty.journal": "No journal data in this date range.",
+    "empty.projects": "No projects yet.",
+    "empty.clients": "No clients yet.",
+    "filters.range": "Date range",
+    "filters.today": "Today",
+    "filters.thisWeek": "This week",
+    "filters.thisMonth": "This month",
+  },
+  clients: {
+    "title": "Clients",
+    "description": "Manage client relationships, projects and follow-ups.",
+    "actions.add": "Add client",
+    "fields.name": "Client name",
+    "fields.email": "Email",
+  },
+  projects: {
+    "title": "Projects",
+    "description": "Track project status, deadlines and client relationships.",
+    "actions.add": "Add project",
+    "actions.risk": "AI risk analysis",
+    "stats.active": "Active projects",
+    "stats.progress": "Average progress",
+    "stats.budget": "Total budget",
+    "fields.name": "Project name",
+    "fields.description": "Description",
+  },
+  tasks: {
+    "title": "Tasks",
+    "description": "Manage work items, priorities and project relationships.",
+    "actions.add": "Add task",
+    "view.kanban": "Kanban",
+    "view.list": "List",
+    "fields.title": "Task title",
+    "fields.description": "Description",
+  },
+  calendar: {
+    "title": "Calendar",
+    "description": "Plan meetings, focus time and deadlines.",
+    "actions.add": "Add event",
+    "event.title": "Event",
+  },
+  finance: {
+    "title": "Finance",
+    "description": "Track income, expenses, payment status and project/client links.",
+    "actions.add": "Add transaction",
+    "actions.ai": "AI analysis",
+  },
+  journal: {
+    "title": "Journal",
+    "description": "Track mood, energy and work notes.",
+    "actions.add": "Add journal entry",
+    "fields.note": "Note",
+  },
+  chat: {
+    "title": "Chat",
+    "description": "Have contextual AI assistant conversations with your work data.",
+    "actions.new": "New chat",
+    "errors.invalid": "Chat request is invalid.",
+  },
+  settings: {
+    "title": "Settings",
+    "language.title": "Languages and translations",
+    "language.default": "Default language",
+  },
+  portal: {
+    "dashboard.title": "Client dashboard",
+    "dashboard.activeProjects": "Active projects",
+    "dashboard.completed": "Completed",
+    "dashboard.averageProgress": "Average progress",
+    "dashboard.allProjects": "All your projects",
+    "projects.title": "Your projects",
+    "projects.empty": "No projects have been assigned to you yet.",
+    "tasks.title": "Completed tasks",
+    "tasks.empty": "No shared tasks yet.",
+    "revisions.title": "Revision requests",
+    "revisions.mine": "My revision requests",
+    "revisions.empty": "You have not created a revision request yet.",
+    "actions.requestRevision": "Request revision",
+    "actions.noRevisionQuota": "No revision quota left",
+    "actions.sendRequest": "Send request",
+    "actions.cancel": "Cancel",
+    "actions.newRequest": "Create new request",
+    "labels.delivery": "Delivery",
+    "labels.deadline": "Due",
+    "labels.progress": "Progress",
+    "labels.project": "Project",
+    "labels.remainingQuota": "Remaining quota",
+    "labels.unlimited": "Unlimited",
+    "tabs.overview": "Overview",
+    "tabs.plan": "Plan & stages",
+    "tabs.revisions": "Revisions",
+    "sections.progress": "Progress",
+    "sections.doneTasks": "Completed work",
+    "empty.tasks": "No tasks to list.",
+    "empty.plan": "No plan has been uploaded yet.",
+    "empty.revisions": "You have not created a revision request yet.",
+    "revision.title": "New revision request",
+    "revision.pendingWarning": "You currently have {count} unresolved revision requests. Are you sure you want to add another?",
+    "revision.descriptionLabel": "Describe the changes you would like in detail",
+    "revision.descriptionPlaceholder": "Could this section be blue? Also, let's update the copy...",
+    "revision.success": "Your revision request has been sent.",
+    "revision.error": "Could not create revision request.",
+    "status.project.active": "Active",
+    "status.project.completed": "Completed",
+    "status.project.waiting": "Waiting",
+    "status.task.todo": "Waiting",
+    "status.task.inProgress": "In progress",
+    "status.task.done": "Completed",
+    "status.revision.pending": "Waiting",
+    "status.revision.inProgress": "In progress",
+    "status.revision.completed": "Completed",
+    "status.revision.rejected": "Rejected",
+  },
+  status: {
+    "project.active": "Active",
+    "project.completed": "Completed",
+    "task.todo": "To do",
+    "task.done": "Done",
+  },
+  validation: {
+    "required": "This field is required.",
+    "invalidLocale": "Locale code is invalid.",
+    "unsupportedLocale": "This language is not supported.",
+  },
+  api: {
+    "errors.unauthenticated": "A valid session is required.",
+    "errors.forbidden": "You are not allowed to perform this action.",
+  },
+} as const satisfies TranslationCatalog;
diff --git a/locales/tr/common.ts b/locales/tr/common.ts
new file mode 100644
index 0000000..da4ad4f
--- /dev/null
+++ b/locales/tr/common.ts
@@ -0,0 +1,15 @@
+export const common = {
+  "actions.save": "Kaydet",
+  "actions.cancel": "İptal",
+  "actions.delete": "Sil",
+  "actions.edit": "Düzenle",
+  "actions.create": "Oluştur",
+  "actions.close": "Kapat",
+  "actions.search": "Ara",
+  "states.loading": "Yükleniyor...",
+  "states.empty": "Henüz kayıt yok.",
+  "states.error": "Bir hata oluştu.",
+  "pagination.previous": "Önceki",
+  "pagination.next": "Sonraki",
+  "plural.item": "{count, plural, one {# kayıt} other {# kayıt}}",
+};
diff --git a/locales/tr/index.ts b/locales/tr/index.ts
new file mode 100644
index 0000000..2f9a425
--- /dev/null
+++ b/locales/tr/index.ts
@@ -0,0 +1,244 @@
+import type { TranslationCatalog } from "@/lib/i18n/types";
+import { common } from "./common";
+
+export const trCatalog = {
+  common: {
+    ...common,
+    "notFound.title": "Sayfa bulunamadı",
+    "notFound.description": "Aradığın sayfa taşınmış, silinmiş veya hiç var olmamış olabilir.",
+    "notFound.backHome": "Ana sayfaya dön",
+    "error.title": "Bir şeyler ters gitti",
+    "error.description": "Beklenmeyen bir hata oluştu. Lütfen tekrar dene.",
+    "error.retry": "Tekrar dene",
+    "maintenance.title": "Bakım modu",
+    "maintenance.description": "Bu çalışma alanı kısa süreli bakımda. Lütfen birazdan tekrar dene.",
+    "itemsCount": "{count, plural, one {# öğe} other {# öğe}}",
+  },
+  auth: {
+    "login.title": "Giriş yap",
+    "login.description": "Neta çalışma alanına erişmek için hesabına giriş yap.",
+    "login.email": "E-posta",
+    "login.emailPlaceholder": "ornek@mail.com",
+    "login.password": "Şifre",
+    "login.forgotPassword": "Şifremi unuttum",
+    "login.submit": "Giriş yap",
+    "login.pending": "Giriş yapılıyor...",
+    "login.setupPrompt": "İlk kurulumu yapmadın mı?",
+    "login.createAdmin": "Admin hesabını oluştur",
+    "register.title": "Admin hesabı oluştur",
+    "register.firstAdminTitle": "İlk admin hesabını oluştur",
+    "register.description": "Bu Neta çalışma alanının ilk yönetici hesabını oluştur.",
+    "register.submit": "Admin hesabını oluştur",
+    "register.pending": "Oluşturuluyor...",
+    "register.hasAccount": "Zaten hesabın var mı?",
+    "register.closed": "Kayıt kapalı. Bu Neta kurulumunda ilk admin hesabı zaten oluşturulmuş.",
+    "register.failed": "Kullanıcı oluşturulamadı.",
+    "forgot.title": "Şifre sıfırlama",
+    "forgot.description": "Self-host kurulumda e-posta sağlayıcısı bağlandığında bu akış aktif edilir.",
+    "forgot.helper": "Şimdilik admin panelinden yeni şifre belirleyebilir veya veritabanındaki kullanıcıyı yönetebilirsin.",
+    "forgot.back": "Giriş sayfasına dön",
+    "reset.title": "Yeni şifre belirle",
+    "reset.description": "Şifre sıfırlama bağlantısı entegrasyonu henüz yapılandırılmadı.",
+    "invite.title": "Portal davetini kabul et",
+    "invite.description": "Davet edilen hesabın için adını ve şifreni belirle.",
+    "invite.email": "E-posta",
+    "invite.displayName": "Ad soyad",
+    "invite.password": "Şifre",
+    "invite.passwordHelp": "En az 8 karakter kullan.",
+    "invite.submit": "Portal hesabını oluştur",
+    "invite.pending": "Hesap oluşturuluyor...",
+    "invite.backToLogin": "Giriş sayfasına dön",
+    "invite.expired": "Bu davetin süresi dolmuş. Freelancer'dan yeni bir bağlantı istemelisin.",
+    "invite.accepted": "Bu davet daha önce kullanılmış. Hesabınla giriş yapabilirsin.",
+    "invite.revoked": "Bu davet iptal edilmiş. Freelancer'dan yeni bir bağlantı istemelisin.",
+    "invite.success": "Portal hesabın oluşturuldu. Şimdi giriş yapabilirsin.",
+    "language": "Dil",
+    "marketing.headline": "Freelancer işlerini, müşterilerini ve finansını tek yerde yönet.",
+    "marketing.description": "{app}, günlük operasyonunu, projelerini, side projectlerini ve temel finans durumunu sade raporlarla takip etmen için tasarlanır.",
+    "marketing.openSource": "Açık kaynak ve self-host edilebilir.",
+    "marketing.github": "GitHub",
+    "marketing.via": "üzerinden ulaşabilirsin.",
+    "marketing.builtBy": "tarafından kodlandı.",
+    "highlights.clients": "Müşteriler",
+    "highlights.calendar": "Takvim",
+    "highlights.finance": "Finans",
+    "highlights.reports": "Raporlar",
+    "messages.invalidCredentials": "E-posta veya şifre hatalı.",
+    "messages.setupUnavailable": "Kayıt kapalı. Bu Neta kurulumunda ilk freelancer hesabı zaten oluşturulmuş.",
+    "messages.setupStateError": "Kurulum durumu okunamadı.",
+    "messages.signupFailed": "Kullanıcı oluşturulamadı.",
+    "messages.portalInviteFailed": "Portal hesabı oluşturulamadı.",
+  },
+  navigation: {
+    "groups.overview": "GENEL BAKIŞ",
+    "groups.operations": "OPERASYON",
+    "groups.personal": "KİŞİSEL",
+    "groups.ai": "AI ASİSTAN",
+    "groups.processes": "SÜREÇLER",
+    "items.dashboard": "Dashboard",
+    "items.calendar": "Takvim",
+    "items.analytics": "Analizler",
+    "items.clients": "Müşteriler",
+    "items.projects": "Projeler",
+    "items.tasks": "Görevler",
+    "items.finance": "Finans",
+    "items.journal": "Günlük",
+    "items.chat": "Sohbet",
+    "items.settings": "Ayarlar",
+    "items.portalProjects": "Projeleriniz",
+    "items.portalTasks": "Yapılan Görevler",
+    "items.portalRevisions": "Revizyon Talepleri",
+    "shell.skipToContent": "Ana içeriğe geç",
+    "shell.homeAriaLabel": "{app} ana sayfa",
+    "shell.mobileMenuAriaLabel": "Ana menüyü aç veya kapat",
+    "shell.mobileMenuTooltip": "Menü",
+    "shell.logoAlt": "{app} logosu",
+    "shell.progressTitle": "Proje ilerlemesi",
+    "shell.progressValue": "%{progress} tamamlandı",
+    "shell.progressAriaLabel": "Proje ilerlemesi",
+    "shell.accountMenuAriaLabel": "{name} için hesap menüsünü aç",
+    "account.signOut": "Çıkış yap",
+    "account.signingOut": "Çıkış yapılıyor",
+    "account.signOutError": "Çıkış yapılamadı. Lütfen tekrar deneyin.",
+  },
+  dashboard: {
+    "title": "Dashboard",
+    "description": "İş performansını, gelirlerini ve günlük durumunu takip et.",
+    "stats.netEarnings": "Net Kazanç",
+    "stats.activeProjects": "Aktif Projeler",
+    "stats.completedTasks": "Tamamlanan Görev",
+    "stats.averageMood": "Ortalama Mood",
+    "sections.financeSummary": "Gelir / Gider Özeti",
+    "sections.moodTrend": "Mood & Enerji Trendi",
+    "sections.recentProjects": "Son Eklenen Projeler",
+    "sections.recentClients": "Son Eklenen Müşteriler",
+    "empty.finance": "Bu tarih aralığında finansal veri yok.",
+    "empty.journal": "Bu tarih aralığında günlük verisi yok.",
+    "empty.projects": "Henüz proje yok.",
+    "empty.clients": "Henüz müşteri yok.",
+    "filters.range": "Tarih aralığı",
+    "filters.today": "Bugün",
+    "filters.thisWeek": "Bu Hafta",
+    "filters.thisMonth": "Bu Ay",
+  },
+  clients: {
+    "title": "Müşteriler",
+    "description": "Müşteri ilişkilerini, projeleri ve takipleri yönetin.",
+    "actions.add": "Müşteri ekle",
+    "fields.name": "Müşteri adı",
+    "fields.email": "E-posta",
+  },
+  projects: {
+    "title": "Projeler",
+    "description": "Proje durumlarını, teslim tarihlerini ve müşteri bağlantılarını takip edin.",
+    "actions.add": "Proje ekle",
+    "actions.risk": "AI Risk Analizi",
+    "stats.active": "Aktif proje",
+    "stats.progress": "Ortalama ilerleme",
+    "stats.budget": "Toplam bütçe",
+    "fields.name": "Proje adı",
+    "fields.description": "Açıklama",
+  },
+  tasks: {
+    "title": "Görevler",
+    "description": "Yapılacak işleri, öncelikleri ve proje bağlantılarını yönetin.",
+    "actions.add": "Görev ekle",
+    "view.kanban": "Kanban",
+    "view.list": "Liste",
+    "fields.title": "Görev başlığı",
+    "fields.description": "Açıklama",
+  },
+  calendar: {
+    "title": "Takvim",
+    "description": "Toplantı, odak zamanı ve teslim tarihlerini planlayın.",
+    "actions.add": "Etkinlik ekle",
+    "event.title": "Etkinlik",
+  },
+  finance: {
+    "title": "Finans İşlemleri",
+    "description": "Gelir, gider, ödeme durumu ve proje/müşteri bağlantılarını takip et.",
+    "actions.add": "İşlem ekle",
+    "actions.ai": "AI Analizi",
+  },
+  journal: {
+    "title": "Günlük",
+    "description": "Mood, enerji ve çalışma notlarını takip edin.",
+    "actions.add": "Günlük ekle",
+    "fields.note": "Not",
+  },
+  chat: {
+    "title": "Sohbet",
+    "description": "İş verilerinle bağlamlı AI asistan görüşmeleri yap.",
+    "actions.new": "Yeni sohbet",
+    "errors.invalid": "Sohbet isteği geçersiz.",
+  },
+  settings: {
+    "title": "Ayarlar",
+    "language.title": "Diller ve çeviriler",
+    "language.default": "Varsayılan dil",
+  },
+  portal: {
+    "dashboard.title": "Müşteri Paneli",
+    "dashboard.activeProjects": "Aktif Projeler",
+    "dashboard.completed": "Tamamlanan",
+    "dashboard.averageProgress": "Ortalama İlerleme",
+    "dashboard.allProjects": "Tüm Projeleriniz",
+    "projects.title": "Projeleriniz",
+    "projects.empty": "Henüz size atanmış bir proje bulunmuyor.",
+    "tasks.title": "Yapılan Görevler",
+    "tasks.empty": "Henüz sizinle paylaşılan bir görev bulunmuyor.",
+    "revisions.title": "Revizyon Talepleri",
+    "revisions.mine": "Revizyon Taleplerim",
+    "revisions.empty": "Henüz bir revizyon talebinde bulunmadınız.",
+    "actions.requestRevision": "Revizyon Talep Et",
+    "actions.noRevisionQuota": "Revizyon Hakkı Bitti",
+    "actions.sendRequest": "Talebi Gönder",
+    "actions.cancel": "İptal",
+    "actions.newRequest": "Yeni Talep Oluştur",
+    "labels.delivery": "Teslim",
+    "labels.deadline": "Son Teslim",
+    "labels.progress": "İlerleme",
+    "labels.project": "Proje",
+    "labels.remainingQuota": "Kalan Hak",
+    "labels.unlimited": "Sınırsız",
+    "tabs.overview": "Genel Bakış",
+    "tabs.plan": "Plan & Aşamalar",
+    "tabs.revisions": "Revizyonlar",
+    "sections.progress": "İlerleme Durumu",
+    "sections.doneTasks": "Yapılan İşler",
+    "empty.tasks": "Listelenecek görev bulunmuyor.",
+    "empty.plan": "Henüz bir plan yüklenmemiş.",
+    "empty.revisions": "Henüz bir revizyon talebi oluşturmadınız.",
+    "revision.title": "Yeni Revizyon Talebi",
+    "revision.pendingWarning": "Şu anda sonuçlanmamış {count} adet revizyon talebiniz var. Yeni bir tane eklemek istediğinize emin misiniz?",
+    "revision.descriptionLabel": "Lütfen yapılmasını istediğiniz değişiklikleri detaylıca açıklayın",
+    "revision.descriptionPlaceholder": "Şu kısmın rengi mavi olabilir mi? Ayrıca metinleri güncelleyelim...",
+    "revision.success": "Revizyon talebiniz başarıyla iletildi.",
+    "revision.error": "Revizyon talebi oluşturulamadı.",
+    "status.project.active": "Aktif",
+    "status.project.completed": "Tamamlandı",
+    "status.project.waiting": "Beklemede",
+    "status.task.todo": "Bekliyor",
+    "status.task.inProgress": "İşleniyor",
+    "status.task.done": "Tamamlandı",
+    "status.revision.pending": "Bekliyor",
+    "status.revision.inProgress": "İşleniyor",
+    "status.revision.completed": "Tamamlandı",
+    "status.revision.rejected": "Reddedildi",
+  },
+  status: {
+    "project.active": "Aktif",
+    "project.completed": "Tamamlandı",
+    "task.todo": "Yapılacak",
+    "task.done": "Tamamlandı",
+  },
+  validation: {
+    "required": "Bu alan zorunludur.",
+    "invalidLocale": "Dil kodu geçersiz.",
+    "unsupportedLocale": "Bu dil desteklenmiyor.",
+  },
+  api: {
+    "errors.unauthenticated": "Geçerli bir oturum gerekli.",
+    "errors.forbidden": "Bu işlem için yetkiniz yok.",
+  },
+} as const satisfies TranslationCatalog;