Oh, lord, my latin is rusty. Uh...

For the top line, "de" means down/away from/off of. "Profundis"...if it's a verb, means "is pouring out." If it's an adjective, it means "deep/profound," and if it's a noun it means "[int the] depths/abyss/chasm."

I think "clamavi" is like "I shouted." "Ad" means "to," "te" is either "you" or "yourself," and "domine" means "master," and that master is the person being spoken to.

I'm not sure what that comes to... "I shouted [into] the abyss to you, master," maybe? HELP.

(The writing on the wall was easy enough, though, as it's a stock phrase.)

Google Translate said:
Out of the depths I cry to thee, O Lord

Seems good enough to me

Praying to God in a Shin Megami Tensei game... bad idea. He isn't going to listen, or, even worse, he might hear you.

There; it's done. I guess it makes sense now!