Language Switcher shows code, not flags

Hello,

on our Website we wanna add the language switcher to our main menu but instead of showing the flags, it only shows code:

<span class=”wpglobus_flag wpglobus_language_name wpglobus_flag_de”></span>
<span class=”wpglobus_flag wpglobus_language_name wpglobus_flag_nl”></span>
<span class=”wpglobus_flag wpglobus_language_name wpglobus_flag_en”></span>
<span class=”wpglobus_flag wpglobus_language_name wpglobus_flag_fr”></span>

what can we do, to get the flags?

We are using the BlueCollar Theme.

The page I need help with: [log in to see the link]