Yuri's solution didn't worked for me. Here is my solution.

Since you create the module with selections like below.

'gender': fields.selection(
        [('male', 'Male'), ('female', 'Female')],

I have added the below code in my template before the output of the field.

<%
   gndr = dict([('male', 'Male'), ('female', 'Female')])
   gndrout = str(gndr[o.gender]) 
%>

Then when displaying, put out the rendered field, as below.

<p>${ gndrout or "" |entity}</p>

This is working for me:

http://www.omniasolutions.eu/OmniaSolutions/index.php?option=com_content&view=article&id=46%3Awebkit-selection-fields&catid=21%3Atechnical-momento&Itemid=30&lang=en