[Langcom] Middle English (& repeated requests)

Here's the newest iteration of the request < https://meta.wikimedia.org/wiki/Requests_for_new_languages/Wikipedia_Middle… which I take it is obviously getting rejected. At this opportunity, I wonder whether we should implement some limitation (e.g. via Titleblacklist) against creating request no. 2, 3, 4, 5 without discussing it with Langcom first. It's a bit pointless to reject requests over and over again, just because people don't accept the policy and create a new one. Meanwhile, if for example a language was previously rejected but has now been recognized in ISO 639-3, that can be easily signalled and a new request created.