Do I need to provide certified translations of my transcripts and degrees?

At the point of your application, you do not need a certified translation. You can put scans of your original documents, and provide a list of your transcripts in English (along with an explanation of the meaning of the grades, e.g. you should specify the scale of the marks: what is the lowest/highest possible mark). You might be required to provide an official translation later in case you are selected.