[#179] Resolve "admins can REMOVE subscribers"

Closes #179 (closed) Note that we already had a version of the REMOVE command available that was intended to remove Admins, it removed them as Admins and Subscribers from the channel and then told them to re-subscribe. I simply added a case to that for if the number was only a Subscriber to remove them from the channel.

I extended the messages in all 4 languages (there are google translations but seemed on point when compared to the other similar messages) and simplified the success message to now be specific about wether the person was an Admin.

The original test assumed that there would be a fail if the number being removed was not an admin so I changed the to expect the subscriber removed success messages (at least I think I did, still finding these tests kinda mysterious).