Fix deletion of unhandled resources where deleting more than 100 caused the server to reject the request.
Fix deletion of unhandled resources where deleting more than 100 caused the server to reject the request.

* Fix an undefined error in the javascript causing it to break.
* Set the checkbox limit to 50.
* Display how many checkboxes where matched, how many where selected and how many there are in total.
* On second search, uncheck non-matched checkboxes.

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