Remove backslash from widget labels
Remove backslash from widget labels

Fixes issue #71

vascotenner/holoviews,ioam/holoviews,mjabri/holoviews,basnijholt/holoviews,basnijholt/holoviews,mjabri/holoviews,mjabri/holoviews,vascotenner/holoviews,ioam/holoviews,ioam/holoviews,vascotenner/holoviews,basnijholt/holoviews