Fix UI internationalization

Review Request #123254 - Created April 4, 2015 and submitted

Lasse Liehu

This connects i18n calls to catalogs so that translated strings are actually shown in the UI.
Also fixes message extraction problems that caused some messages to not be extracted.

Looked at Muon Discover and Muon Update Manager. They appeared as mostly translated. For untranslated parts there are extraction fixes. Didn't test Muon Package Manager because didn't know how to test it in Arch Linux without installing some apt stuff.

Aleix Pol Gonzalez
Lasse Liehu
Review request changed

Status: Closed (submitted)

Change Summary:

Submitted with commit ea65ba7ca908d61a242e1c0a9e00727cc62d91a0 by Lasse Liehu to branch master.