Maybe it would be best to get in contact with the Elgg core developers directly via email and/or a message here on the site to make them aware that you want to become a reviewer. There are a few requests open at Transifex (for older version of Elgg even!) that haven't been dealt with for years most likely because they don't get any notifications about these request and therefore just have missed them.

You could try a mail to info@elgg.org or maybe a message to https://elgg.org/profile/jdalsem or https://elgg.org/profile/jeabakker.

You're welcome

I would say "thanks" if you'd read my post carefully...I want to have a group on this website to support elgg in my native language, Romanian.

Only site admins can create groups here at the Elgg community site. Though I'm not sure if new language/country specific groups are something that's still wanted (the existing groups might still remain for legacy reasons). You could ask via info@elgg.org about it.