bug 596087, update shipped-locales for beta 7, a=blocker

--HG--
extra : transplant_source : %5BA6%BD%15%81%24%80w%0E%9D.%21%40%B4.%82%99%CA4

browser/locales/shipped-locales

@@ -1,13 +1,16 @@
 af
 ak
+ar
 be
 bg
+bn-BD
 br
 ca
 cs
 da
 de
 el
+en-GB
 en-US
 en-ZA
 eo