yourpart3/frontend/src/i18n/index.js

import { createI18n } from 'vue-i18n';
import store from '../store/index.js';

import enGeneral from './locales/en/general.json';
import enHeader from './locales/en/header.json';
import enNavigation from './locales/en/navigation.json';
import enHome from './locales/en/home.json';
import enChat from './locales/en/chat.json';
import enRegister from './locales/en/register.json';
import enError from './locales/en/error.json';
import enActivate from './locales/en/activate.json';
import enSettings from './locales/en/settings.json';
import enAdmin from './locales/en/admin.json';
import enSocialNetwork from './locales/en/socialnetwork.json';
import enFriends from './locales/en/friends.json';
import enFalukant from './locales/en/falukant.json';
import enPasswordReset from './locales/en/passwordReset.json';
import enBlog from './locales/en/blog.json';
import enMinigames from './locales/en/minigames.json';
import enMessage from './locales/en/message.json';
import enPersonal from './locales/en/personal.json';
import enSeo from './locales/en/seo.json';
import cebGeneral from './locales/ceb/general.json';
import cebHeader from './locales/ceb/header.json';
import cebNavigation from './locales/ceb/navigation.json';
import cebHome from './locales/ceb/home.json';
import cebRegister from './locales/ceb/register.json';
import cebActivate from './locales/ceb/activate.json';
import cebError from './locales/ceb/error.json';
import cebMessage from './locales/ceb/message.json';
import cebSettings from './locales/ceb/settings.json';
import cebAdmin from './locales/ceb/admin.json';
import cebPasswordReset from './locales/ceb/passwordReset.json';
import cebSocialNetwork from './locales/ceb/socialnetwork.json';
import cebFriends from './locales/ceb/friends.json';
import cebChat from './locales/ceb/chat.json';
import cebPersonal from './locales/ceb/personal.json';
import cebFalukant from './locales/ceb/falukant.json';
import cebBlog from './locales/ceb/blog.json';
import cebMinigames from './locales/ceb/minigames.json';
import cebSeo from './locales/ceb/seo.json';

import deGeneral from './locales/de/general.json';
import deHeader from './locales/de/header.json'; 
import deNavigation from './locales/de/navigation.json';
import deHome from './locales/de/home.json';
import deChat from './locales/de/chat.json';
import deRegister from './locales/de/register.json';
import deError from './locales/de/error.json';
import deActivate from './locales/de/activate.json';
import deSettings from './locales/de/settings.json';
import deAdmin from './locales/de/admin.json';
import deSocialNetwork from './locales/de/socialnetwork.json';
import deFriends from './locales/de/friends.json';
import deFalukant from './locales/de/falukant.json';
import dePasswordReset from './locales/de/passwordReset.json';
import deBlog from './locales/de/blog.json';
import deMinigames from './locales/de/minigames.json';
import deMessage from './locales/de/message.json';
import dePersonal from './locales/de/personal.json';
import deSeo from './locales/de/seo.json';

import esGeneral from './locales/es/general.json';
import esHeader from './locales/es/header.json';
import esNavigation from './locales/es/navigation.json';
import esHome from './locales/es/home.json';
import esChat from './locales/es/chat.json';
import esRegister from './locales/es/register.json';
import esError from './locales/es/error.json';
import esActivate from './locales/es/activate.json';
import esSettings from './locales/es/settings.json';
import esAdmin from './locales/es/admin.json';
import esSocialNetwork from './locales/es/socialnetwork.json';
import esFriends from './locales/es/friends.json';
import esFalukant from './locales/es/falukant.json';
import esPasswordReset from './locales/es/passwordReset.json';
import esBlog from './locales/es/blog.json';
import esMinigames from './locales/es/minigames.json';
import esMessage from './locales/es/message.json';
import esPersonal from './locales/es/personal.json';
import esSeo from './locales/es/seo.json';

import frGeneral from './locales/fr/general.json';
import frHeader from './locales/fr/header.json';
import frNavigation from './locales/fr/navigation.json';
import frHome from './locales/fr/home.json';
import frChat from './locales/fr/chat.json';
import frRegister from './locales/fr/register.json';
import frError from './locales/fr/error.json';
import frActivate from './locales/fr/activate.json';
import frSettings from './locales/fr/settings.json';
import frAdmin from './locales/fr/admin.json';
import frSocialNetwork from './locales/fr/socialnetwork.json';
import frFriends from './locales/fr/friends.json';
import frFalukant from './locales/fr/falukant.json';
import frPasswordReset from './locales/fr/passwordReset.json';
import frBlog from './locales/fr/blog.json';
import frMinigames from './locales/fr/minigames.json';
import frMessage from './locales/fr/message.json';
import frPersonal from './locales/fr/personal.json';
import frSeo from './locales/fr/seo.json';

function isPlainObject(value) {
  return value !== null && typeof value === 'object' && !Array.isArray(value);
}

/** Tiefes Zusammenführen von Locale-Chunks (ceb überschreibt en nur auf Blattebene, ohne ganze Teilbäume zu verwerfen). */
function deepMerge(target, source) {
  if (!isPlainObject(source)) return target;
  const base = isPlainObject(target) ? { ...target } : {};
  for (const key of Object.keys(source)) {
    const sv = source[key];
    const tv = base[key];
    if (isPlainObject(sv) && isPlainObject(tv)) {
      base[key] = deepMerge(tv, sv);
    } else if (isPlainObject(sv)) {
      base[key] = deepMerge({}, sv);
    } else {
      base[key] = sv;
    }
  }
  return base;
}

function mergeLocaleChunks(chunks) {
  return chunks.reduce((acc, chunk) => deepMerge(acc, chunk), {});
}

const cebLocaleChunks = [
  enGeneral,
  enHeader,
  enNavigation,
  enHome,
  enChat,
  enRegister,
  enPasswordReset,
  enError,
  enActivate,
  enSettings,
  enAdmin,
  enSocialNetwork,
  enFriends,
  enFalukant,
  enBlog,
  enMinigames,
  enMessage,
  enPersonal,
  enSeo,
  cebGeneral,
  cebHeader,
  cebNavigation,
  cebHome,
  cebRegister,
  cebActivate,
  cebError,
  cebMessage,
  cebSettings,
  cebAdmin,
  cebPasswordReset,
  cebSocialNetwork,
  cebFriends,
  cebChat,
  cebPersonal,
  cebFalukant,
  cebBlog,
  cebMinigames,
  cebSeo,
];

const messages = {
  en: {
    ...enGeneral,
    ...enHeader,
    ...enNavigation,
    ...enHome,
    ...enChat,
    ...enRegister,
    ...enPasswordReset,
    ...enError,
    ...enActivate,
    ...enSettings,
    ...enAdmin,
    ...enSocialNetwork,
    ...enFriends,
    ...enFalukant,
    ...enBlog,
    ...enMinigames,
    ...enMessage,
    ...enPersonal,
    ...enSeo,
  },
  ceb: mergeLocaleChunks(cebLocaleChunks),
  de: {
    'Ok': 'Ok',
    ...deGeneral,
    ...deHeader,
    ...deNavigation,
    ...deHome,
    ...deChat,
    ...deRegister,
    ...dePasswordReset,
    ...deError,
    ...deActivate,
    ...deSettings,
    ...deAdmin,
    ...deSocialNetwork,
    ...deFriends,
    ...deFalukant,
    ...deBlog,
    ...deMinigames,
    ...deMessage,
    ...dePersonal,
    ...deSeo,
  },
  es: {
    ...esGeneral,
    ...esHeader,
    ...esNavigation,
    ...esHome,
    ...esChat,
    ...esRegister,
    ...esPasswordReset,
    ...esError,
    ...esActivate,
    ...esSettings,
    ...esAdmin,
    ...esSocialNetwork,
    ...esFriends,
    ...esFalukant,
    ...esBlog,
    ...esMinigames,
    ...esMessage,
    ...esPersonal,
    ...esSeo,
  },
  fr: {
    ...frGeneral,
    ...frHeader,
    ...frNavigation,
    ...frHome,
    ...frChat,
    ...frRegister,
    ...frPasswordReset,
    ...frError,
    ...frActivate,
    ...frSettings,
    ...frAdmin,
    ...frSocialNetwork,
    ...frFriends,
    ...frFalukant,
    ...frBlog,
    ...frMinigames,
    ...frMessage,
    ...frPersonal,
    ...frSeo,
  },
};

const i18n = createI18n({
  locale: store.state.language,
  fallbackLocale: {
    ceb: ['en', 'de'],
    fr: ['de'],
    default: ['de'],
  },
  messages
});

function setGlobalLocale(next) {
  const loc = i18n.global.locale;
  if (loc && typeof loc === 'object' && 'value' in loc) {
    loc.value = next;
  } else {
    i18n.global.locale = next;
  }
}

// Überwache Änderungen der Sprache im Store und aktualisiere i18n (ohne Seiten-Reload)
store.watch(
  (state) => state.language,
  (newLanguage) => {
    setGlobalLocale(newLanguage);
  }
);

export default i18n;