* adds proper handling in case of BadRequest (error 400)
* enhances html template for error 500
* adds new html template for error 400
* adds uuid_required decorator to missing views
* updates translations
* splits konova/views.py into separate files in new module
* view files can now be found in /konova/views/...
* introduces first class based view AbstractLogView
* implemented for Ema, Intervention, Compensation and EcoAccount
