Hi there, thanks for your offer to help with translation!
I went ahead and added your suggested translations. In the future, feel free to add your suggestions directly to the translation project. You can find out more about how translations work on WordPress.com from this support article.
Essentially, it works like a database. You look for the English string and suggest a French translation. Then, a validator for your language (French Canadian) reviews and approves/changes the translations, and then once they are deployed on our end, you will see the changes reflected on the French WordPress.com.