翻译 - 加泰罗尼亚语-拉丁语 - Bon Nadal

"Felicem natalem!" is just "happy birthday!"

Io conoscevo "Natale hilare!" e allora avevo tradotto così.. ma mi rimetto a chi è più esperto di me

And what do you say Pirulito? Or Shamy? Hilare has other meaning in my point of view. But I don't have any proove. So I'm waiting for your opinion.
Where did you find the expression, Shamy.You say you know it. Any authors?

Hm, I'am afraid I have found the (church)expression Dies Natalis for the day of Chirst's day. So, Felicem Diem Natalem! will be the translation.

I don't remember where I found that expression, sincerously.. I think I have read it somewhere, but don't trust in my latin translations, I've studied it at the high school