new lexer request: mediawiki #827
Description
(Original issue 1120 created by None on 2015-06-25T00:48:23.593066+00:00)
See also:
https://github.com/textmate/mediawiki.tmbundle
https://gerrit.wikimedia.org/r/#/c/213964/3/geshi/geshi/mediawiki.php
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