visual 'issue' - reward claim button is not responsive/reactive #216
Description
After claiming reward, the "claim reward" button does not dissapear/deactivate which enable users to press it again and could lead to confusion & irritation. Can we please deactivate/grey-out the button as soon as a user presses "claim".
Tested ENV: OSX 10.14.x and Ubuntu 18.XX - dedicated intel machine - no VM
