i18n Angular avec Transloco : guide de configuration et de traduction

// app.config.ts
import { ApplicationConfig } from '@angular/core';
import { provideHttpClient } from '@angular/common/http';
import {
  provideTransloco,
  TranslocoHttpLoader,
} from '@jsverse/transloco';

export const appConfig: ApplicationConfig = {
  providers: [
    provideHttpClient(),
    provideTransloco({
      config: {
        availableLangs: ['en', 'de', 'ja', 'es', 'fr'],
        defaultLang: 'en',
        fallbackLang: 'en',
        reRenderOnLangChange: true,
        prodMode: true,
      },
      loader: TranslocoHttpLoader,
    }),
  ],
};

// app.module.ts
import { NgModule } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import {
  TranslocoModule,
  TRANSLOCO_LOADER,
  TranslocoHttpLoader,
  provideTransloco,
} from '@jsverse/transloco';

@NgModule({
  imports: [TranslocoModule],
  providers: [
    provideTransloco({
      config: {
        availableLangs: ['en', 'de', 'ja', 'es', 'fr'],
        defaultLang: 'en',
        fallbackLang: 'en',
        reRenderOnLangChange: true,
        prodMode: true,
      },
      loader: TranslocoHttpLoader,
    }),
  ],
})
export class AppModule {}

// assets/i18n/en.json
{
  "nav": {
    "home": "Home",
    "about": "About",
    "settings": "Settings"
  },
  "greeting": "Hello, {{ name }}!",
  "cart": {
    "itemCount": "{count, plural, one {# item} other {# items}}"
  }
}

// assets/i18n/de.json
{
  "nav": {
    "home": "Startseite",
    "about": "Uber uns",
    "settings": "Einstellungen"
  },
  "greeting": "Hallo, {{ name }}!",
  "cart": {
    "itemCount": "{count, plural, one {# Artikel} other {# Artikel}}"
  }
}

<!-- Using the transloco directive (recommended) -->
<ng-container *transloco="let t">
  <h1>{{ t('greeting', { name: userName }) }}</h1>
  <nav>
    <a routerLink="/">{{ t('nav.home') }}</a>
    <a routerLink="/about">{{ t('nav.about') }}</a>
  </nav>
</ng-container>

<!-- Using the transloco pipe -->
<h1>{{ 'greeting' | transloco:{ name: userName } }}</h1>

<!-- Using the structural directive with read -->
<ng-container *transloco="let t; read: 'nav'">
  <a routerLink="/">{{ t('home') }}</a>
  <a routerLink="/about">{{ t('about') }}</a>
</ng-container>

import { Component, inject } from '@angular/core';
import { TranslocoService } from '@jsverse/transloco';

@Component({
  selector: 'app-notification',
  template: '<span>{{ message }}</span>',
})
export class NotificationComponent {
  private translocoService = inject(TranslocoService);
  message = '';

  showSuccess() {
    // Translate in TypeScript
    this.message = this.translocoService.translate('notifications.saved');
  }

  switchLanguage(lang: string) {
    this.translocoService.setActiveLang(lang);
  }
}

// assets/i18n/en.json
{
  "cart": {
    "itemCount": "{count, plural, one {# item} other {# items}}",
    "emptyMessage": "Your cart is empty"
  },
  "notifications": {
    "unread": "{count, plural, =0 {No new notifications} one {# new notification} other {# new notifications}}"
  }
}

// assets/i18n/ar.json — Arabic has 6 plural forms
{
  "cart": {
    "itemCount": "{count, plural, zero {لا عناصر} one {عنصر واحد} two {عنصران} few {# عناصر} many {# عنصرًا} other {# عنصر}}"
  }
}

// Template usage:
// <span>{{ t('cart.itemCount', { count: cartItems.length }) }}</span>

// app.config.ts — with angular-locale-chain
import { ApplicationConfig } from '@angular/core';
import { provideHttpClient } from '@angular/common/http';
import {
  provideTransloco,
  TranslocoHttpLoader,
  TRANSLOCO_LOADER,
  TRANSLOCO_FALLBACK_STRATEGY,
} from '@jsverse/transloco';
import {
  LocaleChainLoader,
  LocaleChainFallbackStrategy,
} from 'angular-locale-chain';

export const appConfig: ApplicationConfig = {
  providers: [
    provideHttpClient(),
    provideTransloco({
      config: {
        availableLangs: ['en', 'fr', 'fr-CA', 'pt', 'pt-BR', 'de', 'de-AT'],
        defaultLang: 'en',
        fallbackLang: 'en',
        reRenderOnLangChange: true,
        prodMode: true,
      },
    }),
    {
      provide: TRANSLOCO_LOADER,
      useFactory: () => {
        const inner = new TranslocoHttpLoader();
        return new LocaleChainLoader(inner, {
          defaultLocale: 'en',
        });
      },
    },
    {
      provide: TRANSLOCO_FALLBACK_STRATEGY,
      useFactory: () => new LocaleChainFallbackStrategy(),
    },
  ],
};

my-angular-app/
├── src/
│   ├── assets/
│   │   └── i18n/
│   │       ├── en.json           # Source language
│   │       ├── de.json           # German
│   │       ├── ja.json           # Japanese
│   │       ├── es.json           # Spanish
│   │       └── fr.json           # French
│   ├── app/
│   │   ├── app.config.ts         # Transloco provider config
│   │   ├── app.component.ts
│   │   └── components/
│   │       └── lang-switcher/
│   │           └── lang-switcher.component.ts
│   └── main.ts
├── angular.json
└── package.json

# In your IDE, ask your AI assistant:
> Translate src/assets/i18n/en.json to German, Japanese, and Spanish

✓ de.json created (1.2s)
✓ ja.json created (1.5s)
✓ es.json created (1.1s)

# Or use the CLI in CI/CD:
npx i18n-agent translate src/assets/i18n/en.json --lang de,ja,es