Add translation support

env.d.ts

@@ -1,9 +1,11 @@
 /// <reference types="vite/client" />
 
 interface ImportMetaEnv {
-    readonly VITE_BACKEND_DOMAIN: string
-    readonly VITE_INSTANCE_DOMAIN: string
-    readonly VITE_HTTPS: string
+    readonly SAFETWITCH_BACKEND_DOMAIN: string
+    readonly SAFETWITCH_INSTANCE_DOMAIN: string
+    readonly SAFETWITCH_HTTPS: string
+    readonly SAFETWITCH_DEFAULT_LOCALE: string
+    readonly SAFETWITCH_FALLBACK_LOCALE: string
     // more env variables...
   }