Fix bug not open tag, channel not exist in tags
Merge branch 'master' of github.com:opps/opps

* 'master' of github.com:opps/opps:
  Change some translations / add new ones
  Flatpages do not need a channel, it defaults to homepage
  Update CHANGELOG.rst
  Fixed conflicts
  contents in homepage generates url without channel slug
  contents in homepage can be accessed without channel in url
  excluded unused fields in multisite admin
  Add new approach on taglist get_queryset