MessagesXx.php contains $magicWords array of synonyms.
The group of synonyms marked to ignore case ignores the case only if all the
synonyms are ASCII, otherwise not.
groups 'revisionday' and 'language' work properly
groups 'uc', 'fullurl' and many others don't - uppercase works properly,
lowercase appears as red link to non-existing template
Tested on cswikipedia 1.9alpha (r17974)