group visual fixes

// FREEBIE
Merge pull request #2276 from mcginty/group-meta-colors

group visual fixes
Fix for old-skool SMS key exchange UI behavior.

Also fixes SMS "end session" messages failing to end session.

// FREEBIE
Bitmap OOM and rotation fixes

// FREEBIE
media preview orientation

// FREEBIE
Updated language translations

// FREEBIE
Remove empty strings.

// FREEBIE
merged  WhisperSystems/master