qt: align amounts on overview page to the right

This is more consistent with other places in the GUI.
qt: language update from transifex

Adds three new languages:

- de_AT: German (Austria)
- gl: Galician
- sl_SI: Slovenian (Slovenia)

Updates many others.

Thanks to the translators contributing on Transifex!
Merge pull request #3248 from laanwj/2013_11_overviewpage_align

qt: align amounts on overview page to the right
Merge pull request #3252 from laanwj/2013_11_transifex_pull

qt: language update from transifex