Last modified: 2013-10-31 08:44:35 UTC
Per BCP 47,[1] "at all times, language tags and their subtags, including private use and extensions, are to be treated as case insensitive", but the ULS performs case-sensitive lang tag matching. This is apparent with jv-java; the ULS won't find a match for canonical jv-Java. [1] https://tools.ietf.org/html/bcp47#section-2.1.1
Patch for webfonts feature: https://github.com/wikimedia/jquery.webfonts/commit/4d9e870881626654102bd7191bf4755c138eca35
The fix has been deployed. The lang tag parsing is case insensitive now. Reopen if you still see problem