Release ubuntu-tweak 0.5.13

Release Ubuntu Tweak 0.5.12

Update debian changelog for 0.5.11

Update debian/changelog for 0.5.10

Update debian/changelog for 0.5.9

Update changelog for 0.5.8

Update translation for Ubuntu Tweak 0.5.7

Update debian/changelog, it is Ubuntu Tweak 0.5.6 now

Update debian/changelog, Ubuntu Tweak 0.5.5 release

Bump version to 0.5.4.1