Remove unused components and models for improved maintainability

- Deleted redundant components (`AddActionButton`, `AlertBox`, `AlertStack`, `BackButton`, `CancelButton`, and `CollapsableArea`) and related files.
- Removed unused models (`Book`, `BookSerie`, `BookTables`, `Character`, and `Chapter`) to reduce codebase clutter.
- Updated project structure and references to reflect these removals.

lib/i18n.ts

@@ -0,0 +1,30 @@
+import i18n from 'i18next';
+import {initReactI18next, useTranslation} from 'react-i18next';
+import fr from '@/lib/locales/fr.json';
+import en from '@/lib/locales/en.json';
+
+i18n.use(initReactI18next).init({
+    resources: {
+        fr: {translation: fr},
+        en: {translation: en},
+    },
+    lng: 'fr',
+    fallbackLng: 'fr',
+    interpolation: {escapeValue: false},
+});
+
+export function useTranslations(namespace?: string) {
+    const {t} = useTranslation();
+    if (namespace) {
+        return (key: string, params?: Record<string, unknown>) =>
+            t(`${namespace}.${key}`, params as Record<string, string>);
+    }
+    return (key: string, params?: Record<string, unknown>) =>
+        t(key, params as Record<string, string>);
+}
+
+export function changeLanguage(lang: string) {
+    i18n.changeLanguage(lang);
+}
+
+export {i18n};