Use a helper to create etherpad group and pad
Use a helper to create etherpad sessions
Hide etherpad button on XS screens
Fix #70
Add a new "wipe data" button in the conf menu
Add the wipe modal and implement logic to wipe data
Both chatHistory (client side only) and etherpad (needs server side) are handled
Fix #68
Add the wipe data button in the help modal
Remove useless msg
Better look for the wipe confirm dialog
Add localization for the new wipe data feature