WL-3242

Add a 'Remove All' checkbox in header
Rename buttons to 'Remove selected polls' and 'Reset selected polls'
Add a JS confirm popup for both buttons 
The text string should be in an i18n file, I'm not sure how you get at RSF i18n properties in JS though.
It's also normally good practice to separate the JS behaviour from the HTML so I'd attach the onclick using jQuery.