Merge branch 'translation-snapshot-october-2015' into 'nightly'

Snapshot of the Transifex translation project - October 2015

It's been 7 months since the last localization update, and the files in the repository are out of sync with the current state of the project. Our Transifex team has since grown to 63 translators, many of them are active members of the GNU social community. I don't know how we will resolve this situation, but it is clear that we have to act. If you plan to redesign the plugin system in the future to support external repository for localizations, that would work as well. But now, please let us do an update. It would be a serious disgrace to the community to throw all of their hard work away.

See merge request !32