Every single page that has exit/entry stamps, visas, or unclear stamps to immigration Canada which are in any language other than English or French.
Usually certified translators charge $5 on each single stamp on one passport. However, if you have one more stamp in other passport, they will charge you $25 for it, as they have done to me. Even though, it was just one single stamp", and it was not even an entry or exit stamp.
I paid $96 after tax.
I have never left Canada since I arrived. However, I had to translate all of the non-English stamps prior to coming to Canada, as the immigration officer during the test date, would not be able to read the dates and know whether they are old or new or what the words on the stapm mean.