prevents repeating translations across apps and projects
django-commontranslations solves the problem that you have repeating translations across apps and projects. It is opinionated about how project specific templates are loaded. The standard makemessages command will create a .po file with all translation strings that it finds the project directory, regardless if it makes sense to explicitly translate them in the context of your project again. It might just be an app template that was overridden in the project, with all the translated strings already translated in the app.
django-commontranslations assumes that your project specific translations reside in a directory configured in the LOCALE_PATHS setting. It is assumed that LANGUAGE_CODE (the default language) is always en or en-us.