Hi,
My Twitch extention have been denied for this reason “Your description must contain an English Portion.”
I don’t know what to do, since the extention description already have an anglish portion 
"Affiche l’agenda des programmes Studio Renegade.
Displays the agenda of Studio Renegade programs."
Can anyone tell me what Twitch wants to see ?
Hey neliger! Since this issue appears to specific to you we would suggest filing a ticket to our support team here: https://twitchdev.zendesk.com/hc/en-us
They should be able to get back to you with more information about your extension failure.
It’s ok now.
For the one who will arrive here, searching for the same error message : in my case this was not really the “description”, but the message given to the moderation team that needed an english portion.