fix issue_category tests and migrate to factories
fix system stack error

* JournalMethods is included multiple times, which triggers the #included? callback on line 68 multiple times, with triggers #alias_method_chain on line 72 multiple times, which will end up in an infinite loop: #user_with_name= is the very same method as #user_without_name=
add a missing translation
slightly switch stuff around to make sure emails are actually sent. before journal.initial? returned true but it needs to false in order to have emails be sent. somebody hopefully knows why :)
fix a test by asserting the correct (non-french!) value
remove darcs scm from openproject core