I'm in the middle of migrating a client to v12 and using Relational Modeling to recreate the dimensions/cubes etc...
There is a missing field in the "Dimension Attribute" Staging table for the "Use as an Element Caption for language" option. I would like to be able to load into this table so it maps my "English" attribute field and use that as the Element Caption in App Studio reports.
The only way I can see to do this is after you've defined the attributes for a dimension is to go into OLAP Modeling and edit the attribute table with the "Use as an Element Caption for language" set:

Am I missing a step here? Asking before I raise this as an enhancement request?