Changed search code to EDS and added label element to form fields

Replaced Encore search code with EDS search code since we switched to
the EBSCO as our discovery tool vendor.

Added label element to to form elements for accessibility. Used CSS to
hide label element from view, but still have it readable by screen
readers.

Replaced Javascript to open EDS search in a new window with
target="_blank" for better user experience and more accessibility.

Added HTML language tag to improve accessibility.