Fix #SL288

Fix #SL288 "icon for mime-type text/x-python" for GCI Task --> https://google-melange.appspot.com/gci/task/view/google/gci2013/5670411782062080 

![captura pantalla de _diario_](https://f.cloud.github.com/assets/2650479/1594345/7f078ac4-52d9-11e3-9630-21b810db6236.png)