Fix GMF theme json example - human readable
Fix GMF theme json example - human readable

Jenselme/ngeo,ger-benjamin/ngeo,adube/ngeo,Jenselme/ngeo,adube/ngeo,camptocamp/ngeo,camptocamp/ngeo,pgiraud/ngeo,pgiraud/ngeo,Jenselme/ngeo,camptocamp/ngeo,kalbermattenm/ngeo,camptocamp/ngeo,ger-benjamin/ngeo,kalbermattenm/ngeo,Jenselme/ngeo,kalbermattenm/ngeo,camptocamp/ngeo,pgiraud/ngeo,adube/ngeo,ger-benjamin/ngeo,adube/ngeo