Merge pull request #1 from FreeRDP/gtk3

All recent changes to Remmina gtk3
Merge remote-tracking branch 'upstream/gtk3' into gtk3
Remove unwanted gettext
Chenge text of preference
Merge remote-tracking branch 'upstream/gtk3' into gtk3
Update translations .po files

Added new strings and merge Ubuntu's translations
from http://packages.ubuntu.com/trusty/translations/
gettext fixes
added missing gettext
.po updates