fixed a bug where 'lang' is clear after call Context::setLang()

git-svn-id: http://xe-core.googlecode.com/svn/branches/maserati@13153 201d5d3c-b55e-5fd7-737f-ddc643e51545
added patterns for youtube.


git-svn-id: http://xe-core.googlecode.com/svn/branches/maserati@13154 201d5d3c-b55e-5fd7-737f-ddc643e51545