It looks like ROT13 text to me, I hope it's not Welsh. Don't want to offend anyone if that's their actual language :)
It's actually Welsh, and the funny thing is that one of the sentences in the example "gibberish" text (although with some further OCR errors) means:
"It will be easy for the knowledgeable to fix the few errors that remain [in the text]". (Bydd yn rwydd iawn i'r cyfarwydd ddiwygio'r ychydig.")
Which is exactly what the OP is doing.
It's actually Welsh, and the funny thing is that one of the sentences in the example "gibberish" text (although with some further OCR errors) means:
"It will be easy for the knowledgeable to fix the few errors that remain [in the text]". (Bydd yn rwydd iawn i'r cyfarwydd ddiwygio'r ychydig.")
Which is exactly what the OP is doing.