bug 82761 US browser not set to correct language in preferences, r=tao, sr=blizzard, a=blizzard

xpfe/browser/resources/locale/en-US/navigator.properties

@@ -16,7 +16,7 @@ jserror=An error has occurred on this page. Double click here for details.
 # all.js
 #
 general.useragent.locale=en-US
-intl.accept_languages=en
+intl.accept_languages=en-us
 intl.charsetmenu.browser.static=iso-8859-1
 intl.charsetmenu.browser.more1=iso-8859-1, iso-8859-15, ibm850, x-mac-roman, windows-1252, iso-8859-14, iso-8859-7, x-mac-greek, windows-1253, x-mac-icelandic, iso-8859-10, iso-8859-3
 intl.charsetmenu.browser.more2=iso-8859-4, iso-8859-13, windows-1257, ibm852, iso-8859-2, x-mac-ce, windows-1250, x-mac-croatian, ibm855, iso-8859-5, iso-ir-111, koi8-r, x-mac-cyrillic, windows-1251, ibm866, koi8-u, x-mac-ukrainian, x-mac-romanian