There isn't a language called Mexican.
enjoy your meal
In italy you should say 'Bon Appetit' (Enjoy Your Meal)
The same way you say it in Mexican.
"Enjoy your meal" is "appréciez votre repas" in French. A standard formula is "bon appétit".
You could borrow the French and say "bon apetit", or say "Enjoy your meal." It literally means "good benefit".
Приятного аппетита Priyatnogo appetita
enjoy your meal
We say "Bon appétit"
Lass es dir schmecken.Guten Appetit!
buon appetito
We just say Bon Appetit or Enjoy your meal...
The dictionary form/infinitive is "geniessen," and if you mean it as a command e.g. "enjoy [your meal]" it would be "geniesst" to a group of friends or "geniessen Sie" to strangers; however, if you are looking for what to say at the start of a meal, Germans simply say "guten Appetit" (bon appetit, or good apptite).