[Merge] lp:~phablet-team/messaging-app/send_message_validators into lp:messaging-app/staging

[Roberto Mier Escandón ]

Review: Approve

Approved. 
Just a comment: I see there are a bunch of quite similar qml dialogs though every one of them have its own qml implementation. I wonder if there would be a way of defining only one qml and fulfill it with certain parameters and a callback ok function pointer as required...
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https://code.launchpad.net/~phablet-team/messaging-app/send_message_validators/+merge/311268
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