The names of modules are accessible via the moduleList, so you would use L10n.Term(".moduleList.Meetings").
However, since you are probably looking for an activity, you can access it via L10n.Term(".activity_dom.Meeting").
That looks like a bug. You should replace L10n.Term("Meeting"), L10n.Term("Call") and L10n.Term("Task") with L10n.Term(".activity_dom.Meeting"), L10n.Term(".activity_dom.Call") and L10n.Term(".activity_dom.Task").
We have applied these fixes to the main code stream.