Do english language marriage documents (notarised) need to be translated into Chinese?

A Chinese citizen relative - by marriage - wants to invite me - a Dutch citizen, permanent resident of Australia to visit him in Shanghai for two weeks in March next year. I note that his invitation letter needs to be supplied hand written both in English and Chinese.
It seems that supporting documents will include two Australian marriage certificates, copies of which will be properly notarized, showing my marriage to my Chinese wife, now permanent resident of Australia, and showing her daughter, although now an Australian citizen, married to the above invitee resident in Shanghai. Do these Australian marriage certificates have to be translated into Chinese?