Trebuchet : Fix cellsize for dynamic changes

When the grid size is changed, this logic does not take that into account.
Fix that by allowing the cellWidth/cellHeight to be set in onMeasure.

Change-Id: I58938eea806a527d1cb54786fa045181455fefff
Trebuchet: Add AF Translations

Change-Id: Iff61e1e450ae39f00eab39eaf593a9a76a77025d