Updated mediawiki/extensions
Project: mediawiki/extensions/MediaWikiChat  56e395c8daf94c0c0988b81dd478208cc31645a8

Remove unused messages

It looks like they are a copy&paste rest.
At least some of the removed messages a duplicate of
https://translatewiki.net/wiki/Special:Translate/ext-wikiforum?filter=&action=translate

If I am wrong and these messages are needed, please change the message key
to avoid duplicate message keys with the WikiForum extension

Change-Id: I2956bed83b62e380fcb5a90c011a4057bf10e6db