Refactors google translate integration

Google Translate Widget Dropdown only display mode added in
https://github.com/codeforamerica/ohana-web-search/pull/540 appears to
have been inadvertently removed. This commit re-sets the dropdown mode
to dropdown only.
Where is the vertical vs horizontal layoutType being defined? Is this something that's meant to be customizable? If so, where? If not, why is this logic?