French or Italian by Nouvelle Rhodes
German by Rejistania
Greek by Buccaneers FC
Latin by Naivetry
Nahuatl by Niur
Spanish by Wingarde
Chinese by Morlago
(Special thanks to Naivetry for the idea.)
Though possibly not the best Irish speaker on this forum, I should be able to try giving translations of your mottos in Irish. I will not be available every day to translate, but perhaps other speakers of an Gaeilge can offer support.
So, without further ado, fire away!