Merge pull request #18 from openfun/issue753_allow_university_group

#753 allow university groups
#723 add view for grades download in fun_instructor app
##723-2.1 catch exception when a file is not found, return 404
Merge pull request #20 from openfun/issue723_grades_download

Issue #723 grades download
Translate "Official" in forum

Fixes issue #868.
Merge pull request #24 from openfun/regis/translate-official

#868 Translate "Official" in forum
Slightly improve universities fr translation file
Use lazy translations in forms
Use lazy translation in models

Fixes #898.
Merge pull request #25 from openfun/regis/translate-admin
Add makemessages_fun translation commands

Go to edxapp and run:

    ./manage.py lms makemessages_fun --settings=fun.lms_dev -l fr

This should update the locale/fr/LC_MESSAGES/django.po file by:

    - adding new, required translations
    - keeping translations that override edx translations
    - removing obsolete translations
Update translations file

This update is performed using the new makemessages_fun script.
Make sure fun theme is translated

Include fun theme in makemessages_fun paths to po files.
Add missing translations from fun theme

Previously, fun theme was not translated at all, as it was all in
French. Now that we handle theme translations (via makemessages_fun), we
are able to localize the theme.