Log Message:
mozo: update to 1.21.1:

### mozo 1.21.1

  * Translations update
  * disable deprecation warnings for distcheck
  * Remove libdir from Mozo/config.py

### mozo 1.21.0

  * Translations update
  * drop acinclude.m4 which is not needed anymore
  * Support new mate-menus api
  * just reindent python code