Mms: Fix "done" action

Sends message on landscape "done"
    action (previously did nothing)

PS2: Conform with usual send:
    Pop-up toast messages.

Change-Id: Ia36ce4daaba4a90d582cbe0e20b06c93e9b5afb2
Updated simplified Chinese translations.

Change-Id: Ia79ad8e4d5107f345cbc07ffbc7af8beaa9d1ec4
 MMS: Memory leak when enters and exit Messaging

The listeners is not removed. So the GC will not release the
contact and conversation activity instances, Memory leak.

Clean the listeners When activity is destroyed.
Signed-off-by: apophis9283 <steaven.android@gmail.com>

Change-Id: I43f31643c252047d667218745ab827cb5c950428