Update translations from Transifex

Signed-off-by: Daniele Ricci <daniele.athome@gmail.com>
Fix unread badge showing when not needed

Signed-off-by: Daniele Ricci <daniele.athome@gmail.com>
Fix database upgrade errors (fix #202)

Signed-off-by: Daniele Ricci <daniele.athome@gmail.com>
Fix XMPP upgrade issues

Signed-off-by: Daniele Ricci <daniele.athome@gmail.com>
Fix some other XMPP upgrade issues

Signed-off-by: Daniele Ricci <daniele.athome@gmail.com>
Merge branch 'master' into audio_message
Merge branch 'audio_message' into ptt_message