I would bet that you have some 3rd party add-on installed, as ArchiCAD does not use language files - rather, it has a different version for each language.
Move all CadImage, Cigraph, Encina and other 3rd party add-ons from your Add Ons folder into a temporary folder. Start AC again. Do you get the message? (I imagine not.) Quit, and restore add-ons until you see the message and determine who is causing it ... and then contact that manufacturer if indeed that is the case.
Karl
One of the forum moderators
AC 28 USA and earlier • macOS Sequoia 15.2, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB