Fix typo in placeholder static url
Fix typo in placeholder static url

geotagx/pybossa,stefanhahmann/pybossa,jean/pybossa,Scifabric/pybossa,PyBossa/pybossa,OpenNewsLabs/pybossa,jean/pybossa,PyBossa/pybossa,OpenNewsLabs/pybossa,geotagx/pybossa,inteligencia-coletiva-lsd/pybossa,inteligencia-coletiva-lsd/pybossa,stefanhahmann/pybossa,Scifabric/pybossa