[FIX] m.Label in Form, ":" not set if text is updated

Change-Id: I25618c4da7f1c965f79a388b50ac6278fd32fe32
BCP: 1482023936
CR-Id: 012003146900009497942014
Merge "[FIX] m.Label in Form, ":" not set if text is updated" into rel-1.26