Upgrade Babel from 0.9.6 to 1.3.  This needs a minor adjustment in the tests, but the result looks more like what it should already have been before.
Upgrade all but lingua to their latest versions.
Upgrade lingua from 1.4 to 3.6.1.  This completely changes lingua's API.  See docs/developing/basic/translations.rst for details on the greatly simplified new usage.
Update translations.
Merge branch 'feature/336_upgrade_upstream_packages'

* feature/336_upgrade_upstream_packages:
  Update translations.
  Upgrade lingua from 1.4 to 3.6.1.  This completely changes lingua's API.  See docs/developing/basic/translations.rst for details on the greatly simplified new usage.
  Upgrade all but lingua to their latest versions.
  Upgrade Babel from 0.9.6 to 1.3.  This needs a minor adjustment in the tests, but the result looks more like what it should already have been before.