Translations update

- Updated translations
- Feature: Language menu now check the language in use
Update

- Fix module updater progress bar
- Correction of a typo in the revert revision box
- Updated TODO
- Incremented version to 1.0
Update

- Register language at first launch
- Restored version number to 0.15 to hold 1.0 until the new update
method is done
- German and polish translation for the installer (previous commit)
Updated todo
Merge remote-tracking branch 'origin/devel'