Code cleanup #3064: reorganize imports, other minor pep8 fixes
Add a few more "REFRESH_PAGE" on_success
Remove language tab for advanced settings
Remove unused i18n_compat from menus, use i18n from Django instead
Fix typo in exception name: NamespaceAllreadyRegistered -> NamespaceAlreadyRegistered
Reverting "Remove language tab for advanced settings"
Merge branch 'develop' of github.com:jimmylam/django-cms into develop
Reverting unwanted merge
Merge branch 'develop' of github.com:divio/django-cms into develop
Merge pull request #3075 from mmarzantowicz/refactor

Code cleanup #3064: reorganize imports, other minor pep8 fixes
Info in CHANGELOG about exception name change
Merge pull request #3091 from mmarzantowicz/menus-cleanup

Menus cleanup
Merge pull request #3077 from jimmylam/develop

Add a few more "REFRESH_PAGE" on_success