Here is the English version of your text:
The text tells about the noble champion Finn MacCumhaill and his band of warriors, the Fianna, who were the guardians of the High Kings of Ireland.
Leprechauns are among the popular figures in Irish folklore; they are fairies who make shoes and guard treasures in the form of a pot filled with gold. If you manage to catch a leprechaun, he will have to reveal the secret location of his treasure. But he will try to make you look away for just a moment, and he will disappear.