Update fr.yml
Update fr.yml

I corrected several errors than the previous "proofreader" may not has seen.

Problems:
- I don't know what "POSSE" mean in english so I am not able to translate it in french. Maybe you wanted to write "post" instead?
- We still need translate this one => fill_the_twitter_credentials: "fill in the oauth credentials"
publify/publify,Juuro/publify,hmallett/publify,jcfausto/publify,whithajess/publify,telekomatrix/publify,drakontia/publify,sf-wdi-25/publify_debugging_lab,hmallett/publify,telekomatrix/publify,K-and-R/publify,K-and-R/publify,freibuis/publify,telekomatrix/publify,blairanderson/that-music-blog,SF-WDI-LABS/publify_debugging_lab,hmallett/publify,solanolabs/publify,seyedrazavi/publify,Juuro/publify,sf-wdi-25/publify_debugging_lab,K-and-R/publify,publify/publify,mozzan/publify,jcfausto/publify,freibuis/publify,jcfausto/publify,seyedrazavi/publify,blairanderson/that-music-blog,freibuis/publify,SF-WDI-LABS/publify_debugging_lab,seyedrazavi/publify,blairanderson/that-music-blog,SF-WDI-LABS/publify_debugging_lab,whithajess/publify,mozzan/publify,sf-wdi-25/publify_debugging_lab,solanolabs/publify,mozzan/publify,whithajess/publify,publify/publify,solanolabs/publify,drakontia/publify,Juuro/publify