[Merge] lp:~phablet-team/messaging-app/show-participants-mms-groups into lp:messaging-app/staging

[Roberto Mier Escandón ]

Review: Needs Fixing

Ouch!
I see as group name the (first participant name + n additional participants in the group) for RCS groups once i get out and in of messaging-app
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https://code.launchpad.net/~phablet-team/messaging-app/show-participants-mms-groups/+merge/310431
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