Enatega Customer Application (App Language)

Is your feature request related to a problem? Please describe.
The application is asking for a specific language to select and when the user does that, the whole application gets reloaded.

Describe the solution you'd like
the application should be able to picked the language the system is already using and make it its default language.

No files, tests, or entry points are named. Start by locating the customer application's language-selection behavior and its initial language detection, then verify how the app reloads after a language choice. Done means the app detects the system language as its default without requiring a specific manual selection.

Written by the indexing model from the issue text.