Friends area bugs like not removing invitations

Hello,
At my https://www.corplace.com/en/friends everything is working perfect. But if you load the greek version: https://www.corplace.com/corpfriends

The links like https://www.corplace.com/corpfriends/invites are not loading at once but demand page refresh.

Specific, at https://www.corplace.com/corpfriends/requests if you hit Ακύρωση Αιτήματος (Cancel Request) I get Internal Server Error

Is there any language constant that is mandatory to be translated?

Thanks!