Opening the Cheat Sheet leads to UnicodeDecodeError at line 425

When I open Tools -> Keymaps -> Cheat Sheet I get a blank tab "Keymaps Cheat Sheet" and message at the console:

    Traceback (most recent call last):
      File "./Keymaps.py", line 597, in render
        elf.renderer.render(rendered)
      File "./Keymaps.py", line 471, in render
        keymaps_view.insert(edit, keymaps_view.size(), self.header)
      File "./Keymaps.py", line 425, in header
        hr=hr)
    UnicodeDecodeError: 'ascii' codec can't decode byte 0xd0 in position 0: ordinal not in range(128)