Abu Hassaan said:
I recommend to send certified true copies of all documents which are photocopies of originals (even originals are in English or French) to negate any chance of rejection at CIO or to avoid any delay in Visa Office.
My understanding from "document checklist" and "Guide" is,
1) For documents not in english or french it is a must to have thing. Both the translation aswell as the copy of original must be notarized. This can even result in rejection or delay at some stage.
2) For all other documents, It is good to have them notarized. If it is not costing you much, go for it. If you dont notarize, for sure, application will not be rejected and I dont foresee a delay either.
3) PCC, if not in english or french, requirements are much more stringent. Application guide has the details.