Tested model translations for inherited models
Merge branch 'develop' of github.com:jplusplus/arte-world-of-work into develop
Updated translations system to make it work with inheritance
Added (& tested) a without method in app.utils
Changed test_translations instruction in Makefile
Fixed verbosity issue for translation sync_db_translation command
Added make task for django messages collection
Added core translation file with registering of core models translations
Merge branch 'develop' of github.com:jplusplus/arte-world-of-work into develop
Fixed inheritance issue for Selection and Radio questions