@zverik @SomeoneElse name_en and name_de are essentially for compatibility with the openmaptiles schema. I don't think anybody plans on limiting things to that.
The question is likely more is the route OMT took to allow any name:xx in the tiles the best approach or wouldn't it make sense to have language(-groups?) specific tiles that contain the label layers.
@simon @SomeoneElse yeah I don't think the language issue won't be resolved. But it is an indicator of the general narrowness of the schema.
I assume, MapTiler schema was born out of the Mapbox one, so there has been a lot of work poured into it. I wonder why not use it for a start, given it's the most popular on the market.