adding game icon to the bottom bar

https://github.com/ProjetDeRechercheSurLecriture/DyslexDisorthGame/issues/188
hiding all audiences except child and teacher, and putting game labels in french

fixes https://github.com/ProjetDeRechercheSurLecriture/DyslexDisorthGame/issues/189
formatting save button to be on the right side
making previous last image of a testblock show while we wait for the next block and delaying 2 seconds

before showing the prompt to go into the test block. fixes https://github.com/ProjetDeRechercheSurLecriture/DyslexDisorthGame/issues/190
making participant details scrollable where ever they appear