Packsonflite
You are correct, Chinese is now an official language of ICAO. However,the official languages are the working languages of ICAO and do not relate to ATC communications. As JJFlyer says ICAO does not require the use of English for ATC communications. If I remeber rightly (I haven't the relevant Annex to the Chicago Convention with me) the ICAO requirement is that ATC communications should be carried out in the language of the ground station but that communications must be available in english if requested by a pilot. While French ATC may deviate from what has become accepted practice they fully comply with the requirements of the relevant Annex.