Use of term 'filter' in search sidebar

[higs4281]

The activity search’s sidebar uses the word "filter," which can be misleading, because if you select more than one box you can actually widen your search, which is the opposite of filtering.
Two thoughts:

• Maybe the phrase "Show specific activity features" would be more accurate?
• If we want the current verbiage, "Refine your search" or "Adjust your search" may be a little less misleading than "Filter your search."

Filtering by one box:

Filtering by two boxes:

[nbucknor]

@knomat (Matt Humphrey) would have better input on this than I would.