Problem when inviting members to conversations

A few days ago, I created a group conversation and wanted to invite some Italian students. However, it was annoying, because all my friends were displayed, including those who deleted their accounts (showed as [membername]). I remember this was the case for the Share on LingQ function, then you fixed it so that only members studying the given language are listed. Could you do the same for these invitations, please?
And, in both cases, it would really help if the usernames could be sorted alphabetically.

We will try and do some work on the tutor interface when creating conversations. We’ll remember this then.

Thanks, Mark!