bug 1048050 - ignore region (or other) subtags when checking for language-specific casing behavior. r=smontagu
bug 1048050 - additional reftests to cover cases with and without region subtag. r=smontagu

--HG--
rename : layout/reftests/text-transform/greek-uppercase-1.html => layout/reftests/text-transform/greek-uppercase-1a.html
rename : layout/reftests/text-transform/greek-uppercase-1.html => layout/reftests/text-transform/greek-uppercase-1b.html
rename : layout/reftests/text-transform/irish-lowercase-1.html => layout/reftests/text-transform/irish-lowercase-1a.html
rename : layout/reftests/text-transform/irish-lowercase-1.html => layout/reftests/text-transform/irish-lowercase-1b.html