Hi @artgirl! No, the translators don't need to be certified as I find that the best translators are those with knowledge about and interest for the subject. There will be Steem and non-Steem related translations.
The best way to contact me is really Discord, since I read my messages there every day. Alternatively, you can send me a message on Twitter. My handle there is TheMissLasVegas :)
Thank you for your interest and I hope to hear from you soon!