Thanks everyone participating in this conversation.
Common Voice current strategy about languages and accents is being reworked after months of work with linguists and technical people: 🗣 Feedback needed: Languages and accents strategy (we expect this to be implemented mid-end this year).
Currently we are accepting new languages that are part of this standard unicode list.
For French we are capturing it as a dataset language and we plan to capture how different people speak French worldwide.
If you language is in the list I provided, it can be enabled following the usual procedure.
Please check both documents, and ask any questions if needed 
Thanks!