dm.MWTemplateSpecModel: Resolve translations through the TemplateData API

Also removed comment in ui.MWTransclusionDialog that was
copied from dm.MWTemplateSpecModel.

Bug: 50888
Change-Id: I9dcfef3ae65fe716bae91f703f9169171448797a
Merge "dm.MWTemplateSpecModel: Resolve translations through the TemplateData API"