As you can see, the translation reads:
The underlined part is where the translations fail. There should be the assigned key printed there.Kann auch durch bad control sequence, alt control locales only valid for mouse button inputs zum manuellen Verbinden...
Cause of the issue:
The German description of copper-cable uses the placeholder "__ALT_CONTROL__1__build__", which is an alternative translation of "__CONTROL__build__" to better match the grammar. But these alternative translations are only available for mouse inputs: When you change the input to a keyboard key, the translation fails with "bad control sequence, alt control locales only valid for mouse button inputs" instead of printing the assigned key in some way.
- Change the game language to German. Restart the game to apply the change.
- Change the keybind of "Build" (or "Bauen" in German) to any key on the keyboard, lets say "P" for "problem"
- Start a new game, and hover over the copper cable. You see the miss-translated description as shown in the screenshot.