feat(i18n): improved i18n contribution documentation (#292)

CONTRIBUTING.md

@@ -37,17 +37,7 @@ We use **[Conventional Commits](https://www.conventionalcommits.org/)** to keep
 
 ## i18n
 
-### Adding a New Language
-
-To contribute to the translation of the app, you can add a new language file in the [`packages/app-client/src/locales`](./packages/app-client/src/locales) directory. The file should be named according to the language code (e.g., `fr.json` for French). You can then add the new language to the `locales` array in the [`packages/app-client/src/modules/i18n/i18n.constants.ts`](./packages/app-client/src/modules/i18n/i18n.constants.ts) file.
-
-The reference language file is [`en.json`](./packages/app-client/src/locales/en.json) it contains all the keys used in the app. You can use this file as a reference to create the new language file.
-
-You can list the missing keys for each language by running the following command in the `app-client` package:
-
-```bash
-pnpm script:get-missing-i18n-keys
-```
+Information about the translation process can be found in the [locales README](./packages/app-client/src/locales/README.md).
 
 ### Updating an Existing Language
 

packages/app-client/src/locales/README.md

@@ -0,0 +1,31 @@
+# Contributing to Translations
+
+We welcome contributions to improve and expand the app's internationalization (i18n) support. Below are the guidelines for adding a new language or updating an existing translation.
+
+## Adding a New Language
+
+1. **Create a Language File**: To add a new language, create a JSON file named with the appropriate [ISO language code](https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes) (e.g., `fr.json` for French) in the [`packages/app-client/src/locales`](./) directory.
+
+2. **Use the Reference File**: Refer to the [`en.json`](./en.json) file, which contains all keys used in the app. Use it as a base to ensure consistency when creating your new language file. And act as a fallback if a key is missing in the new language file.
+
+3. **Update the Locale List**: After adding the new language file, include the language code in the `locales` array found in the [`locales.ts`](./locales.ts) file.
+
+4. **[Optional] Check for Missing Keys**: You can verify that all translation keys are included by running the following command in the `app-client` package:
+
+   ```bash
+   pnpm script:get-missing-i18n-keys
+   ```
+
+5. **Submit a Pull Request**: Once you've added the file and updated `locales.ts`, create a pull request (PR) with your changes. Ensure that your PR is clearly titled with the language being added (e.g., "Add French translations").
+
+## Updating an Existing Language
+
+To improve or correct an existing language:
+
+1. **Edit the Language File**: Make updates directly to the relevant JSON file in the [`packages/app-client/src/locales`](./) directory.
+
+2. **Submit a Pull Request**: After making your changes, submit a pull request. Clearly describe the updates in the PR.
+
+---
+
+Thank you for helping us make the app accessible to a broader audience!

packages/app-client/src/locales/locales.test.ts

@@ -1,10 +1,18 @@
+import { access, constants } from 'node:fs/promises';
 import { flatten } from '@solid-primitives/i18n';
 import { chain, difference, get, keys } from 'lodash-es';
 import { describe, expect, test } from 'vitest';
 import defaultLocale from './en.json';
+import { locales } from './locales';
+
+function fileExists(relativePath: string) {
+  const path = new URL(relativePath, import.meta.url).pathname;
+
+  return access(path, constants.F_OK).then(() => true).catch(() => false);
+}
 
 const localesFiles = import.meta.glob('./*.json', { eager: true });
-const locales = chain(localesFiles)
+const localesKeys = chain(localesFiles)
   .map((value, key) => ({
     key: key.replace('./', '').replace('.json', ''),
     value: get(value, 'default') as any,
@@ -16,11 +24,17 @@ const flattenedDefault = flatten(defaultLocale);
 
 describe('locales', () => {
   test('locales should not have extra keys compared to default locale', () => {
-    locales.forEach(({ key, value }) => {
+    localesKeys.forEach(({ key, value }) => {
       const flattened = flatten(value);
       const extraKeys = difference(keys(flattened), keys(flattenedDefault));
 
       expect(extraKeys).to.eql([], `Extra keys found in ${key}.json`);
     });
   });
+
+  test('ensure all defined locales have a file in the locales folder', async () => {
+    for (const { key } of locales) {
+      expect(await fileExists(`./${key}.json`)).to.eql(true, `Missing file for locale ${key}`);
+    }
+  });
 });

packages/app-client/src/locales/locales.ts

@@ -0,0 +1,13 @@
+// Order of locales matters, keep it sorted by the native language name
+export const locales = [
+  { key: 'ar', name: 'العربية' },
+  { key: 'zh-CN', name: '简体中文' },
+  { key: 'de', name: 'Deutsch' },
+  { key: 'en', name: 'English' },
+  { key: 'es', name: 'Español' },
+  { key: 'fr', name: 'Français' },
+  { key: 'it', name: 'Italiano' },
+  { key: 'pt', name: 'Português' },
+  { key: 'ru', name: 'Русский' },
+  { key: 'vi', name: 'Tiếng Việt' },
+] as const;

packages/app-client/src/modules/i18n/i18n.constants.ts

@@ -1,52 +0,0 @@
-export const locales = [
-  {
-    key: 'ar',
-    file: 'ar',
-    name: 'العربية',
-  },
-  {
-    key: 'en',
-    file: 'en',
-    name: 'English',
-  },
-  {
-    key: 'de',
-    file: 'de',
-    name: 'Deutsch',
-  },
-  {
-    key: 'fr',
-    file: 'fr',
-    name: 'Français',
-  },
-  {
-    key: 'it',
-    file: 'it',
-    name: 'Italiano',
-  },
-  {
-    key: 'es',
-    file: 'es',
-    name: 'Español',
-  },
-  {
-    key: 'pt',
-    file: 'pt',
-    name: 'Português',
-  },
-  {
-    key: 'ru',
-    file: 'ru',
-    name: 'Русский',
-  },
-  {
-    key: 'vi',
-    file: 'vi',
-    name: 'Tiếng Việt',
-  },
-  {
-    key: 'zh-CN',
-    file: 'zh-CN',
-    name: '简体中文',
-  },
-] as const;

packages/app-client/src/modules/i18n/i18n.provider.tsx

@@ -1,10 +1,10 @@
 import type { ParentComponent } from 'solid-js';
+import { locales } from '@/locales/locales';
 import * as i18n from '@solid-primitives/i18n';
 import { makePersisted } from '@solid-primitives/storage';
 import { merge } from 'lodash-es';
 import { createContext, createResource, createSignal, Show, useContext } from 'solid-js';
 import defaultDict from '../../locales/en.json';
-import { locales } from './i18n.constants';
 
 export {
   useI18n,

packages/app-client/src/modules/ui/layouts/app.layout.tsx

@@ -50,6 +50,7 @@ const LanguageSwitcher: Component = () => {
 
       <DropdownMenuItem as="a" class="flex items-center gap-2 cursor-pointer" target="_blank" rel="noopener noreferrer" href="https://github.com/CorentinTh/enclosed/tree/main/packages/app-client/src/locales">
         {t('navbar.settings.contribute-to-i18n')}
+        <div class="i-tabler-external-link text-lg text-muted-foreground"></div>
       </DropdownMenuItem>
     </>
   );

packages/app-client/src/scripts/get-missing-i18n-keys.script.ts

@@ -2,10 +2,10 @@ import { readFile } from 'node:fs/promises';
 import { join } from 'node:path';
 import { flatten } from '@solid-primitives/i18n';
 import { difference, keys, omitBy } from 'lodash-es';
-import { locales } from '../modules/i18n/i18n.constants';
+import { locales } from '../locales/locales';
 
 const localesContent = await Promise.all(locales.map(async (locale) => {
-  const filePath = join('src', 'locales', `${locale.file}.json`);
+  const filePath = join('src', 'locales', `${locale.key}.json`);
   const fileContent = await readFile(filePath, 'utf-8');
 
   return {