Problem

In InstantTranslate for new users languages will be selected as defined in  runtimeOptions.InstantTranslate.user.defaultLanguages 
After first use, the selected languages of the user should be persistent, but they are not

Languages fall back to the default languages defined in the config.

Solution

When a user selects languages for text translation and logs out OR moves to file translation tab, and then goes back to text field tab (or logs in again), the selected languages should stay.

When a user selects a client in the file translation tab, this should be persistent, when leaving the tab.

The language or languages selected in the file translation tab should be persistent, too. No matter if user logs out or just moves to text translation tab.