use Perl instead of Java as a base language for JS files; rebase translations
Merge remote-tracking branch 'upstream/master'
French translation update
Merge pull request #404 from RaphaelRochet/master

French translation update
Update messages.po
Merge pull request #405 from Trottel/patch-2

Update messages.po
Updated german translation
Merge pull request #406 from HeikoAdams/master

Updated german translation
Update messages.po
Merge pull request #408 from Trottel/patch-3

Update messages.po
Merge remote-tracking branch 'upstream/master'