Unknown command line break
When you press enter without anything happening in the game at the time, the message field displays information about unknown key, like any other time you press a key without an assigned function.
However, since it's the 'enter' key, the game treats the key literally and brakes the line in two, so we have something like this:
Unknown command '
', press ? for help.
I think it should display this in one line like any other unassigned key.