reoganizing the fields to put the optional fields on teh bottom, and experiment fields seperate from the user fields

for https://github.com/ProjetDeRechercheSurLecriture/DyslexDisorthGame/issues/186
making start and end and experiment duration human readable
setting participatns first second and third language is persisting to and from the database

for https://github.com/ProjetDeRechercheSurLecriture/DyslexDisorthGame/issues/186
moved elanguages to fielddb
verifyin user has languages set