Remove click events from Filter category labels (#102)

This pull request addresses issue #102, removing click events from Category labels in the Filter. It turns them instead into just regular text. Some additional white space cleanup is included.

Padding was required for the categories since they lost their former span padding. Tested on both Firefox and Chrome and the layout is identical.

Adding @andreieftimie and @whimboo for visibility.
When the markup ceased being spans and became labels, they lost their span padding values. This ensures that the new labels receive correct padding, and the layout and dimensions are identical to what they were before.

nth-child() uniquely targets the "To:" label in the Date field.