Bug 1026159 - override search result label styles to wrap 2 lines

Make global adjustments to grid item height (+4px)
Add override rules for the search grid items to allow line-wrapping and set height/line-height to clip after the 2nd line. As discussed with UX, removed text-shadow in this case where it is less necessary and would otherwise also get clipped. 
Same as above, space before the !important to follow what we do elsewhere.