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.