refactor(update-backend): streamline .env file handling process

- Replaced the previous method of copying .env files with a direct installation from a specified source path.
- Improved permissions and ownership settings for the .env file to enhance security.
- Added user feedback for successful file transfer and verification steps.

frontend/src/i18n/locales/de/general.json

@@ -30,6 +30,7 @@
         "loading": "Lädt...",
         "back": "Zurück",
         "cancel": "Abbrechen",
+        "ok": "OK",
         "yes": "Ja",
         "no": "Nein"
     },

frontend/src/i18n/locales/en/general.json

@@ -30,6 +30,7 @@
         "loading": "Loading...",
         "back": "Back",
         "cancel": "Cancel",
+        "ok": "OK",
         "yes": "Yes",
         "no": "No"
     },

frontend/src/i18n/locales/es/general.json

@@ -30,6 +30,7 @@
         "loading": "Cargando...",
         "back": "Atrás",
         "cancel": "Cancelar",
+        "ok": "Aceptar",
         "yes": "Sí",
         "no": "No"
     },