add an all-locales for xulrunner, just to satisfy check-out, copy fx list, r=bsmedberg

xulrunner/locales/all-locales

+ar
+bg
+ca
+cs
+da
+de
+el
+en-GB
+es-AR
+es-ES
+eu
+fi
+fr
+ga-IE
+gu-IN
+he
+hu
+hy-AM
+it
+ja
+ja-JP-mac
+ko
+nb-NO
+nl
+nn-NO
+mk
+mn
+pa-IN
+pl
+pt-BR
+ro
+ru
+sk
+sl
+sq
+sv-SE
+tr
+zh-CN
+zh-TW