Issue number 149. Changed label in sent messages form "pending" to "sms", as requested.

https://github.com/ushahidi/SMSSync/issues/149
Merge pull request #153 from 123725/develop

Changed label in sent messages form "pending" to "sms"...
Merge remote-tracking branch 'upstream/develop' into develop
#120 - Tasks for sending sms should appear in pending tray, before going to sent tray