Fix typo in english/US message (#2938)

"is activate" -> "is activated"

conf/locale/locale_en-US.ini

@@ -945,7 +945,7 @@ auths.pam_service_name = PAM Service Name
 auths.enable_auto_register = Enable Auto Registration
 auths.tips = Tips
 auths.edit = Edit Authentication Setting
-auths.activated = This authentication is activate
+auths.activated = This authentication is activated
 auths.new_success = New authentication '%s' has been added successfully.
 auths.update_success = Authentication setting has been updated successfully.
 auths.update = Update Authentication Setting