Add:
static/js/index.advanced-search-form.js, static/sass/index.sass,
static/css/lib/jqueryui.custom.min.css
-Add `jQuery UI` autocompletion menu to the advanced-search form's
language input field, to replace `twitter typeahead` (which was
incompatible with the new form's style rules).
static/js/index.advanced-search-form.js
-Add regex field specifier to query string.