Set default language according to browser language

Author: Stigmatoz

src/plugins/i18n.ts

@@ -1,11 +1,12 @@
 import { createI18n } from 'vue-i18n';
+import Browser from 'webextension-polyfill';
 import en from '../_locales/en/messages.json';
 import ru from '../_locales/ru/messages.json';
 
 const i18n = createI18n({
   legacy: false,
-  locale: import.meta.env.VITE_I18N_LOCALE || 'en',
-  fallbackLocale: import.meta.env.VITE_I18N_FALLBACK_LOCALE || 'en',
+  locale: Browser.i18n.getUILanguage(),
+  fallbackLocale: 'en',
   globalInjection: true,
   messages: {
     en,