Fix ergoemacs-describe-key.
Added back ergoemacs-describe-key
v5.13.12-4:
- Fixed ergoemacs-mode to work with translation keymaps (Issue #138).
- Added ergoemacs-describe-key.  This allows:
  - Describing more ergoemacs-mode key combinations including:
    - <Alt<->Ctl> translations
    - Unchorded key translations
  - Shows ergoemacs-style keys while reading keyboard input instead of
    emacs style keys.