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 or tests are named. Start by locating the customer app's language-selection and startup locale handling, then reproduce the reload that occurs when a language is chosen. Done means the app adopts the system language as its default without reloading.

Written by the indexing model from the issue text.