fix(ui): stop old translations and page shrink on Android

The translation files get a content version in their URL, so a
browser that cached an old file loads the new one. On touch
screens the scroll lock of menus and selects no longer adds a
right margin: Android Chrome reported one and the whole page
became narrower.

src/i18n.js

@@ -9,7 +9,8 @@ i18n.use(HttpBackend)
         lng: 'de',
         fallbackLng: 'en',
         backend: {
-            loadPath: '/i18n/{{lng}}.json',
+            // A browser kept an old file without its Cache-Control and showed raw keys; a new URL per version avoids that.
+            loadPath: `/i18n/{{lng}}.json?v=${__TRANSLATIONS_VERSION__}`,
         },
         interpolation: {
             escapeValue: false