Rename the label "Filter results:" to "Search my results:"

[paulhennings]

Expected behavior

Present the word "Search" to the user. The user understands that text they enter will show them matching results in the list below.

Actual behavior

Using the term "filter" is somewhat misleading when the behavior of the function is to search the result set for matching text.

Also, we will be adding a true filter function soon (see issue #3), so this label needs to be renamed to avoid confusion.

Steps to reproduce

Load index.html. Observe label below the map.