Bug #373787 --> For a fresh en-US profile, be sure to select the en-US dictionary by default.

r=axel
sr=bienvenu

mail/locales/en-US/all-l10n.js

@@ -37,3 +37,4 @@
 #filter substitution
 
 pref("general.useragent.locale", "@AB_CD@");
+pref("spellchecker.dictionary", "@AB_CD@");