[Feature Request] Disable "Normal" vs. "Touch"

That is definitively a thing I want to improve. The current Touch vs Normal is a bit restrictive as well.
I'm planning on extending this versioning to support any input type or other category ( trello.com/c/slJ2P9aM/3-extend-input-specialization )

As part of that change, there will be a way to disable the input types so that they take the default value without having to force you to clear the content in order to be overridden.
Said that, in the current implementation, if you want the Normal and Touch to use the same translation, select any of them and clear the translations. If the translation of any of them is empty, it will use the translation in the other mode.