change account settings header title to "Settings" (bug 804714)

mkt/account/templates/account/settings.html

@@ -1,7 +1,7 @@
 {% extends 'mkt/base.html' %}
 
 {% set pagetitle = _('Account Settings') %}
-{% set headertitle = _('Settings') %}
+{% set headertitle = _('Account') %}
 {% set bodyclass = 'settings' %}
 {% set page_parent = '/' %}