Changed the relationship name

- Changed "from_user" in "um_from_user"
- Changed "to_user" in "um_to_user"
Changed the Translations

- Changed "to_user" in "um_to_user"
- Changed "from_user" in "um_from_user"
Updated the relationships name in umessages

- Updated "to_user" in "um_user_to"
- Updated "from_user" in "um_from_user"
Updated the translation files

- Updated "to_user" in "um_user_to"
- Updated "from_user" in "um_from_user"
Merge branch 'refs/heads/umessage_namespacing'
Merge branch 'master' of https://github.com/LeonardoGentile/django-userena
Merge branch 'master' into LeonardoGentile-master
Version bump to 1.2.2.
Merge branch 'master' of github.com:bread-and-pepper/django-userena