Fix #600 - broken labels in Betting and Exchange

I checked the file history, the bug was introduced in September, when @phillipsio accidentally typed data-blind instead of data-bind in commits 52a0d330245eba2c69d23e81c2b502edb29d399c and 68dd79e7e660223e1d3624889205dca6af288ae2

Fixes issue #600.