Arthur (arthuro555 in this forum) provided me with a german translation (‘AOSMessagesDE.XML’).
So now the game is available in german language as well. 
MANY thanks Arthur for your very quick help on this!
Damien.
PS. I wait for my Italian friend (and his own translation file ‘AOSMessagesIT.XML’) to create a new game version and to upload it to Itch-IO.
Stay tuned… @AlpesGames