Bug 958577 - Add Uyghur to the list of RTL languages; r=smontagu

modules/libpref/src/init/all.js

@@ -1399,6 +1399,7 @@ pref("font.language.group",                 "chrome://global/locale/intl.propert
 pref("intl.uidirection.ar", "rtl");
 pref("intl.uidirection.he", "rtl");
 pref("intl.uidirection.fa", "rtl");
+pref("intl.uidirection.ug", "rtl");
 pref("intl.uidirection.ur", "rtl");
 
 // use en-US hyphenation by default for content tagged with plain lang="en"