Code in RTL should still be displayed LTR

git-svn-id: http://textpattern.googlecode.com/svn/development/4.x@5514 2fea6a4d-a838-0410-917b-93a53c48e9d2
Don't need to specify `unicode-bidi`

git-svn-id: http://textpattern.googlecode.com/svn/development/4.x@5515 2fea6a4d-a838-0410-917b-93a53c48e9d2
Merge remote-tracking branch 'upstream/master'