* removes admin backend views which are not important for production
* adds filtering functionalities on index views
* simplifies detail views on intervention, compensation, ecoaccount and ema
* adds autocomplete fields on detail views
* adds handy horizontal filter fields on detail views
* moves diff_states message back to table top for direct presentation in compensation/detail/view.html
* removes diff_states rendering in deadline card in compensation/detail/view.html
* fixes before_state adding based on GET parameter
* refactors UserActionlogEntryEnum into a UserAction TextChoice (Django 3.x)
* adds ordering of compensation states depending on surface value
* refactors ServerMessageImportance from enum into TextChoice (Django 3.x)
* adds/updates translations
