refactor(i18n): move locale updater to language switch button

Set the default language to the fallback language if the navigator
language is not supported.

src/App.vue

@@ -18,9 +18,11 @@ limitations under the License.
 import Navbar from './features/nav/components/Navbar.vue';
 import Footer from './features/footer/components/Footer.vue';
 
+import { LANGUAGE_PATH } from './config/featureSettings.js';
 import { updatePageTitle } from './router';
 import { useSettings } from './features/settings/composables/useSettings.js';
-import { computed, watch, watchEffect } from 'vue';
+import { setLocale } from './i18n';
+import { computed, onMounted, watch, watchEffect } from 'vue';
 import { useRoute } from 'vue-router';
 
 const route = useRoute();
@@ -51,6 +53,10 @@ watch(colorScheme, (newColorScheme) => {
 updateColorScheme(colorScheme.value);
 
 watchEffect(() => updatePageTitle(route));
+
+onMounted(() => {
+    setLocale(getSetting(LANGUAGE_PATH));
+});
 </script>
 
 <template>

src/config/featureSettings.js

@@ -0,0 +1,17 @@
+/*
+Copyright 2026 Seekra
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+export const LANGUAGE_PATH = ['general', 'language'];

src/features/i18n/components/LanguageSwitchButton.vue

@@ -17,23 +17,25 @@ limitations under the License.
 <script setup>
 import Icon from '@/features/icons/components/Icon.vue';
 
-import { ref } from 'vue';
+import { LANGUAGE_PATH } from '@/config/featureSettings';
+import { useSettings } from '@/features/settings/composables/useSettings';
+import { ref, watch } from 'vue';
 import { useI18n } from 'vue-i18n';
-import { loadLanguage, LANGUAGES_RTL, SUPPORTED_LANGUAGES } from '@/i18n';
+import { setLocale, SUPPORTED_LANGUAGES } from '@/i18n';
 
 const { t, locale } = useI18n();
+const { setSetting, getSetting } = useSettings();
 
 const isOpen = ref(false);
 const languageDropdown = ref(null);
 
-async function selectLanguage(code) {
-    await loadLanguage(code);
-    localStorage.setItem('locale', code);
-    document.documentElement.lang = code;
-    document.documentElement.dir = LANGUAGES_RTL.includes(code) ? 'rtl' : 'ltr';
+const selectLanguage = function selectLanguage (code) {
+    setSetting(LANGUAGE_PATH, code);
     close();
 };
 
+watch(() => getSetting(LANGUAGE_PATH), setLocale);
+
 const close = function () {
     document.removeEventListener('click', closeWrapperOnClickOutsite);
     isOpen.value = false;

src/features/i18n/components/__tests__/LanguageSwitchButton.test.js

@@ -14,41 +14,19 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import { expect, test, describe, vi, beforeEach } from 'vitest';
-import { mount } from '@vue/test-utils';
+import { LANGUAGE_PATH } from '@/config/featureSettings.js';
+import { useSettings } from '@/features/settings/composables/useSettings.js';
+import { mountComponent } from '@/test-utils/mountComponent.js';
+import { expect, test, describe } from 'vitest';
 import LanguageSwitchButton from '../LanguageSwitchButton.vue';
-import { loadLanguage } from '@/i18n';
 
-vi.mock('@/i18n', () => ({
-    loadLanguage: vi.fn(() => Promise.resolve()),
-    LANGUAGES_RTL: ['ar', 'he'],
-    SUPPORTED_LANGUAGES: ['en', 'de', 'ar']
-}));
-
-vi.mock('vue-i18n', () => ({
-    useI18n: () => ({
-        t: (key) => key,
-        locale: { value: 'de' }
-    })
-}));
-
-vi.mock('@/features/icons/components/Icon.vue', () => ({
-    default: {
-        name: 'Icon',
-        template: '<span>Icon</span>'
-    }
-}));
+const getWrapper = function getWrapper () {
+    return mountComponent(LanguageSwitchButton);
+};
 
 describe('LanguageSwitchButton', () => {
-    beforeEach(() => {
-        vi.clearAllMocks();
-        localStorage.clear();
-        document.documentElement.lang = '';
-        document.documentElement.dir = '';
-    });
-
     test('renders correctly with initial state closed', () => {
-        const wrapper = mount(LanguageSwitchButton);
+        const wrapper = getWrapper();
         
         expect(wrapper.find('.language-button').exists()).toBe(true);
         expect(wrapper.find('.language-dropdown').exists()).toBe(false);
@@ -56,7 +34,7 @@ describe('LanguageSwitchButton', () => {
     });
 
     test('opens the dropdown when language button is clicked', async () => {
-        const wrapper = mount(LanguageSwitchButton);
+        const wrapper = getWrapper();
         const button = wrapper.find('.language-button');
         
         await button.trigger('click');
@@ -65,33 +43,28 @@ describe('LanguageSwitchButton', () => {
         expect(button.attributes('aria-expanded')).toBe('true');
     });
 
-    const languageTestCases = [
-        { code: 'en', expectedDir: 'ltr' },
-        { code: 'de', expectedDir: 'ltr' },
-        { code: 'ar', expectedDir: 'rtl' }
-    ];
+    test('sets the language when clicking it', async () => {
+        const { getSetting } = useSettings();
 
-    test.for(languageTestCases)('selectLanguage($code) sets localStorage, html attributes and changes layout direction to $expectedDir', async ({ code, expectedDir }) => {
-        const wrapper = mount(LanguageSwitchButton);
+        const wrapper = getWrapper();
         
         await wrapper.find('.language-button').trigger('click');
         
         const options = wrapper.findAll('.language-dropdown li');
-        const optionToClick = options.find(opt => opt.text().includes(code));
 
-        await optionToClick.trigger('click');
+        const enOption = options.find(opt => opt.text().includes('en'));
+        await enOption.trigger('click');
+        expect(getSetting(LANGUAGE_PATH)).toBe('en');
+        expect(wrapper.find('.language-dropdown').exists()).toBe(false);
 
-        expect(loadLanguage).toHaveBeenCalledWith(code);
-        expect(localStorage.getItem('locale')).toBe(code);
-        expect(document.documentElement.lang).toBe(code);
-        expect(document.documentElement.dir).toBe(expectedDir);
+        const deOption = options.find(opt => opt.text().includes('de'));
+        await deOption.trigger('click');
+        expect(getSetting(LANGUAGE_PATH)).toBe('de');
         expect(wrapper.find('.language-dropdown').exists()).toBe(false);
     });
 
     test('closes the dropdown when clicking outside the component', async () => {
-        const wrapper = mount(LanguageSwitchButton, {
-            attachTo: document.body
-        });
+        const wrapper = getWrapper();
 
         await wrapper.find('.language-button').trigger('click');
         expect(wrapper.find('.language-dropdown').exists()).toBe(true);

src/features/i18n/utils/__tests__/navigatorLanguage.test.js

@@ -0,0 +1,51 @@
+/*
+Copyright 2026 Seekra
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import { getNavigatorLanguage } from '../navigatorLanguage';
+import { describe, expect, test } from 'vitest';
+
+describe('navigatorLanguage', () => {
+    test.for([
+        { navigatorLanguage: 'en',                      expected: 'en'},
+        { navigatorLanguage: 'de',                      expected: 'de'},
+        { navigatorLanguage: 'fr',                      expected: 'fr'},
+
+        { navigatorLanguage: 'en-US',                   expected: 'en'},
+        { navigatorLanguage: 'en-AU',                   expected: 'en'},
+        { navigatorLanguage: 'de-DE',                   expected: 'de'},
+        { navigatorLanguage: 'fr-FR',                   expected: 'fr'},
+
+        { navigatorLanguage: 'en-us',                   expected: 'en'},
+        { navigatorLanguage: 'en-au',                   expected: 'en'},
+        { navigatorLanguage: 'de-de',                   expected: 'de'},
+        { navigatorLanguage: 'fr-fr',                   expected: 'fr'},
+
+        { navigatorLanguage: 'zh-Hans-CN',              expected: 'zh'},
+        { navigatorLanguage: 'zh-Hant-TW',              expected: 'zh'},
+        { navigatorLanguage: 'uz-Latn-UZ',              expected: 'uz'},
+
+        { navigatorLanguage: 'en-US-u-ca-gregory',      expected: 'en'},
+        { navigatorLanguage: 'de-DE-u-co-phonebk',      expected: 'de'},
+        { navigatorLanguage: 'zh-Hant-TW-u-co-phonebk', expected: 'zh'}
+    ])('returns language $expected with navigator language $navigatorLanguage', ({ navigatorLanguage, expected }) => {
+        Object.defineProperty(navigator, 'language', {
+            value: navigatorLanguage,
+            configurable: true
+        });
+
+        expect(getNavigatorLanguage()).toBe(expected);
+    });
+});

src/features/i18n/utils/navigatorLanguage.js

@@ -14,9 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-export default function getCurrentLanguage () {
-    const saved = localStorage.getItem('locale');
-    if (saved) return saved;
+export const getNavigatorLanguage = function getNavigatorLanguage () {
     const locale = new Intl.Locale(navigator.language);
     return locale.language;
 };

src/features/settings/composables/__tests__/useSettings.test.js

@@ -22,7 +22,7 @@ import { beforeEach, describe, expect, test, vi } from 'vitest';
 const settingDefaultValue = vi.hoisted(() => 42);
 const settingPath = ['test', 'number'];
 
-vi.mock('../../settings.json', () => ({
+vi.mock('../../config.js', () => ({
     default: {
         contents: [
             {

src/features/settings/composables/useSettings.js

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import settings from '../settings.json';
+import settings from '../config.js';
 import { useSettingsStore } from '../stores/settingsStore';
 import { getSettingRecursively } from '../utils/getSetting';
 

src/features/settings/config.js

@@ -0,0 +1,75 @@
+/*
+Copyright 2026 Seekra
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import { getNavigatorLanguage } from '../i18n/utils/navigatorLanguage';
+import { fallbackLocale, SUPPORTED_LANGUAGES } from '@/i18n';
+
+let defaultLanguage;
+{
+    const navigatorLanguage = getNavigatorLanguage();
+    if (SUPPORTED_LANGUAGES.includes(navigatorLanguage)) {
+        defaultLanguage = navigatorLanguage;
+    } else {
+        defaultLanguage = fallbackLocale;
+    }
+}
+
+export default {
+    contents: [
+        {
+            name: 'general',
+            i18n: 'settings.settings.general.title',
+            content: [
+                {
+                    name: 'language',
+                    type: 'selection',
+                    i18n: 'settings.settings.general.settings.language.title',
+                    default: defaultLanguage,
+                    options: SUPPORTED_LANGUAGES.map((language) => ({
+                        name: language,
+                        i18n: `preferences.locale.languages.${language}`
+                    }))
+                }
+            ]
+        },
+        {
+            name: 'appearance',
+            i18n: 'settings.settings.appearance.title',
+            content: [
+                {
+                    name: 'colorScheme',
+                    type: 'selection',
+                    i18n: 'settings.settings.appearance.contents.colorScheme.title',
+                    default: 'auto',
+                    options: [
+                        {
+                            name: 'auto',
+                            i18n: 'settings.settings.appearance.contents.colorScheme.options.auto'
+                        },
+                        {
+                            name: 'light',
+                            i18n: 'settings.settings.appearance.contents.colorScheme.options.light'
+                        },
+                        {
+                            name: 'dark',
+                            i18n: 'settings.settings.appearance.contents.colorScheme.options.dark'
+                        }
+                    ]
+                }
+            ]
+        }
+    ]
+};

src/features/settings/settings.json

@@ -1,30 +0,0 @@
-{
-    "contents": [
-        {
-            "name": "appearance",
-            "i18n": "settings.settings.appearance.title",
-            "content": [
-                {
-                    "name": "colorScheme",
-                    "type": "selection",
-                    "i18n": "settings.settings.appearance.contents.colorScheme.title",
-                    "default": "auto",
-                    "options": [
-                        {
-                            "name": "auto",
-                            "i18n": "settings.settings.appearance.contents.colorScheme.options.auto"
-                        },
-                        {
-                            "name": "light",
-                            "i18n": "settings.settings.appearance.contents.colorScheme.options.light"
-                        },
-                        {
-                            "name": "dark",
-                            "i18n": "settings.settings.appearance.contents.colorScheme.options.dark"
-                        }
-                    ]
-                }
-            ]
-        }
-    ]
-}

src/features/settings/views/SettingsView.vue

@@ -18,7 +18,7 @@ limitations under the License.
 import LeftSidebarLayout from '@/layouts/LeftSidebarLayout.vue';
 import SettingsPage from '../components/SettingsPage.vue';
 
-import settingsConfiguration from '../settings.json';
+import settingsConfiguration from '../config.js';
 import { getSettingRecursively } from '../utils/getSetting.js';
 import { computed, onMounted, ref, watch } from 'vue';
 import { useI18n } from 'vue-i18n';

src/features/settings/views/__tests__/SettingsView.test.js

@@ -197,7 +197,7 @@ const settings = settingsHoisted.values();
 const originalCurrentSection = 's0';
 let currentSection = originalCurrentSection;
 
-vi.mock('../../settings.json', () => ({
+vi.mock('../../config.js', () => ({
     default: { contents: settingsHoisted }
 }));
 

src/i18n.js

@@ -15,7 +15,6 @@ limitations under the License.
 */
 
 import { createI18n } from 'vue-i18n';
-import getCurrentLanguage from './utils/currentLanguage';
 
 export const fallbackLocale = 'en';
 
@@ -34,7 +33,7 @@ export const SUPPORTED_LANGUAGES = [
 
 export const i18n = createI18n({
     legacy: false,
-    locale: getCurrentLanguage(),
+    locale: fallbackLocale,
     fallbackLocale: fallbackLocale,
     messages: {}
 });
@@ -58,3 +57,9 @@ export async function loadLanguage (locale) {
 
     loadedLanguages.add(locale);
 };
+
+export const setLocale = async function setLocale (locale) {
+    await loadLanguage(locale);
+    document.documentElement.lang = locale;
+    document.documentElement.dir = LANGUAGES_RTL.includes(locale) ? 'rtl' : 'ltr';
+};

src/locales/de.json

@@ -74,6 +74,14 @@
                         }
                     }
                 }
+            },
+            "general": {
+                "title": "Allgemein",
+                "settings": {
+                    "language": {
+                        "title": "Sprache"
+                    }
+                }
             }
         }
     },

src/locales/en.json

@@ -74,6 +74,14 @@
                         }
                     }
                 }
+            },
+            "general": {
+                "title": "General",
+                "settings": {
+                    "language": {
+                        "title": "Language"
+                    }
+                }
             }
         }
     },

src/main.js

@@ -20,7 +20,6 @@ import { createPinia } from 'pinia';
 import piniaPluginPersistedstate from 'pinia-plugin-persistedstate';
 import App from './App.vue'
 import { i18n, loadLanguage, fallbackLocale } from './i18n';
-import getCurrentLanguage from './utils/currentLanguage';
 import router from './router'
 import './styles/common.css'
 import './styles/variables/colors.css'
@@ -30,7 +29,7 @@ import rawFonts from './styles/fonts.json';
 import './styles/common.css';
 import './styles/variables/colors.css';
 
-import settings from './features/settings/settings.json';
+import settings from './features/settings/config.js';
 import { validateSettingsConfig } from './features/settings/utils/settingsValidator';
 
 (async () => {
@@ -53,7 +52,6 @@ import { validateSettingsConfig } from './features/settings/utils/settingsValida
     fonts.forEach((font) => document.fonts.add(font));
 
     await loadLanguage(fallbackLocale);
-    await loadLanguage(getCurrentLanguage());
 
     const pinia = createPinia();
     pinia.use(piniaPluginPersistedstate);

src/utils/__tests__/currentLanguage.test.js

@@ -1,61 +0,0 @@
-/*
-Copyright 2026 Seekra
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-import { describe, expect, test } from 'vitest';
-import getCurrentLanguage from '../currentLanguage';
-
-describe('currentLanguage', () => {
-    test.for([
-        { navigatorLanguage: 'en',                      localStorageLanguage: null, expected: 'en'},
-        { navigatorLanguage: 'de',                      localStorageLanguage: null, expected: 'de'},
-        { navigatorLanguage: 'fr',                      localStorageLanguage: null, expected: 'fr'},
-
-        { navigatorLanguage: 'en-US',                   localStorageLanguage: null, expected: 'en'},
-        { navigatorLanguage: 'en-AU',                   localStorageLanguage: null, expected: 'en'},
-        { navigatorLanguage: 'de-DE',                   localStorageLanguage: null, expected: 'de'},
-        { navigatorLanguage: 'fr-FR',                   localStorageLanguage: null, expected: 'fr'},
-
-        { navigatorLanguage: 'en-us',                   localStorageLanguage: null, expected: 'en'},
-        { navigatorLanguage: 'en-au',                   localStorageLanguage: null, expected: 'en'},
-        { navigatorLanguage: 'de-de',                   localStorageLanguage: null, expected: 'de'},
-        { navigatorLanguage: 'fr-fr',                   localStorageLanguage: null, expected: 'fr'},
-
-        { navigatorLanguage: 'zh-Hans-CN',              localStorageLanguage: null, expected: 'zh'},
-        { navigatorLanguage: 'zh-Hant-TW',              localStorageLanguage: null, expected: 'zh'},
-        { navigatorLanguage: 'uz-Latn-UZ',              localStorageLanguage: null, expected: 'uz'},
-
-        { navigatorLanguage: 'en-US-u-ca-gregory',      localStorageLanguage: null, expected: 'en'},
-        { navigatorLanguage: 'de-DE-u-co-phonebk',      localStorageLanguage: null, expected: 'de'},
-        { navigatorLanguage: 'zh-Hant-TW-u-co-phonebk', localStorageLanguage: null, expected: 'zh'},
-
-        { navigatorLanguage: 'en',                      localStorageLanguage: 'de', expected: 'de'},
-        { navigatorLanguage: 'de-DE',                   localStorageLanguage: 'en', expected: 'en'},
-        { navigatorLanguage: 'de-de',                   localStorageLanguage: 'en', expected: 'en'},
-        { navigatorLanguage: 'zh-Hans-CN',              localStorageLanguage: 'fr', expected: 'fr'},
-        { navigatorLanguage: 'en-US-u-ca-gregory',      localStorageLanguage: 'zh', expected: 'zh'}
-    ])('returns the language $expected (navigator: $navigatorLanguage; local storage: $localStorageLanguage)', ({ navigatorLanguage, localStorageLanguage, expected }) => {
-        Object.defineProperty(navigator, 'language', {
-            value: navigatorLanguage,
-            configurable: true
-        });
-
-        if (localStorageLanguage) {
-            localStorage.setItem('locale', localStorageLanguage);
-        };
-
-        expect(getCurrentLanguage()).toBe(expected);
-    });
-});