Commands under Tools have descriptions - except for UILang de which is more in need of one because it is abbreviated "code" not meaningful to many users.
This is a debugging/support command.
The program language can be set via Program Settings as documented here: https://ref.ly/logosres/logos4help?hw=Program+Settings&off=2832&ctx=+support+footnotes.%0a~Language%0aSets+the+la
Ah, I went by the wiki so I'll reference @Dave Hooton
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