A very interesting topic you picked there Maya! I myself find languages adorable, yet I do not know many of them.
Let me add some more:
Irish gaelic, or simply irish: The original language used in Ireland. Linguistically it forms a group with Scottish gaelic and Manx, named Q-Celtic (as opposed to P-Celtic, which consists of Brythonic, Welsh and another lang. which I cannot remember at the moment). Today, due to the lengthy english occupation,irish has somewhat faded with english taking its place, especially in major cities. Yet there are still regions, called Gaeltacht, in which irish is the primary language used. There exist various dialects, the most prominant ones being Ulster, Munster and Donegal.
It is written nowadays using the latin alphabet, minus the letters q,v,w,x. In the very old days, druids would use Ogham letters, which consisted of lines and were meant to be carved at the edges of stones. You must bear in mind, though, that pronunciation rules are completely different from english, e.g.
bean in irish is pronounced "ban" and means woman! (hence
bean sidhe, commonly known as banshee

)
These could be considered common phrases (unfortunately I cannot provide an accurate english pronunciation, because I do not remember all pronunciation rules by heart!). Also acute accents are omitted because they do not show up in this encoding
Dia dhuit - Hello (literally, "God with you" I think)
Conas ata tu? - How are you?
Slan go foill - Bye for now
Oiche mhaith, codlach samh - Goodnight, sleep well
Breithla sona dhuit - Happy birthday
I will try and figure out the way these should be pronounced

By the way, the info about the arabic language was very interesting, I am glad you wrote it! Also: I thought it was "ohayo konzai mas " in japanese, at least that's what I hear all the time in anime