Last modified: 2006-02-20 03:41:26 UTC
As you can see on the following picture ( http://tr.wikipedia.org/wiki/Resim:Tr_alfabe.png ) in Turkish alphabet letters "ı" and "i" are different letters. And their capitalization are same as they look just longer. ("I" and "İ" respectively). But as you may know "i" is capitalized as "I" at most languages and so in MediaWiki, which is wrong for Turkish.
Fixed in LanguageTr.php, rev 1.4
CLOSING
Please see bug 5047 comment 2 Bug 5047: Support for UTF-8 characters in {{lc:}} and {{uc:}}