Translation:The happy priestesses are praising the gods.
I don't know whether voktys includes clerics of The Seven or not. Probably best to assume Essosi priests for now.
Since Valyrian doesn't have gender by male/female, the word is the same for both priest and priestess. Septa and Septon is based on The Seven (septem being the latin word for seven), so it's probably based off the "common tongue" rather than Valyrian.