feat(i18n): add French language support and enhance localization

- Introduced French as a supported language across the application, updating locale files and adding translations for various components.
- Enhanced language handling logic to accommodate French, ensuring proper detection and fallback mechanisms.
- Updated UI elements to include French language options, improving accessibility for French-speaking users.
- Refactored SEO handling to include French in hreflang links, enhancing search engine indexing for multilingual content.
- Added new scripts for managing French translations and ensuring consistency across language files.

backend/migrations/20260402120000-add-ui-locale-fr-user-param-value.cjs

@@ -0,0 +1,30 @@
+'use strict';
+
+/** @type {import('sequelize-cli').Migration} */
+module.exports = {
+  async up(queryInterface) {
+    await queryInterface.sequelize.query(`
+      INSERT INTO type.user_param_value (user_param_type_id, value, order_id)
+      SELECT upt.id, 'fr', COALESCE(
+        (SELECT MAX(v.order_id) FROM type.user_param_value v WHERE v.user_param_type_id = upt.id),
+        0
+      ) + 1
+      FROM type.user_param upt
+      WHERE upt.description = 'language'
+        AND NOT EXISTS (
+          SELECT 1 FROM type.user_param_value x
+          WHERE x.user_param_type_id = upt.id AND x.value = 'fr'
+        );
+    `);
+  },
+
+  async down(queryInterface) {
+    await queryInterface.sequelize.query(`
+      DELETE FROM type.user_param_value v
+      USING type.user_param upt
+      WHERE v.user_param_type_id = upt.id
+        AND upt.description = 'language'
+        AND v.value = 'fr';
+    `);
+  },
+};

backend/services/authService.js

@@ -144,7 +144,7 @@ export const loginUser = async ({ username, password }) => {
     const mappedParams = params.map(param => {
         return { 'name': param.paramType.description, 'value': param.value };
     });
-    const uiLocaleCodes = ['de', 'en', 'ceb', 'es'];
+    const uiLocaleCodes = ['de', 'en', 'ceb', 'es', 'fr'];
     const langEntry = mappedParams.find((p) => p.name === 'language');
     if (langEntry?.value && !uiLocaleCodes.includes(langEntry.value)) {
         const idNum = parseInt(langEntry.value, 10);

backend/utils/initializeTypes.js

@@ -67,7 +67,7 @@ const initializeTypes = async () => {
     }
     const valuesList = {
         gender: ['male', 'female', 'transfemale', 'transmale', 'nonbinary'],
-        language: ['de', 'en', 'ceb', 'es'],
+        language: ['de', 'en', 'ceb', 'es', 'fr'],
         eyecolor: ['blue', 'green', 'brown', 'black', 'grey', 'hazel', 'amber', 'red', 'other'],
         haircolor: ['black', 'brown', 'blonde', 'red', 'grey', 'white', 'other'],
         hairlength: ['short', 'medium', 'long', 'bald', 'other'],