Add role to search (mmistakes#3086)

Author: lsolesen

_includes/search/search_form.html

@@ -2,15 +2,15 @@
   {%- assign search_provider = site.search_provider | default: "lunr" -%}
   {%- case search_provider -%}
   {%- when "lunr" -%}
-  <form class="search-content__form" onkeydown="return event.key != 'Enter';">
+  <form class="search-content__form" onkeydown="return event.key != 'Enter';" role="search">
     <label class="sr-only" for="search">
       {{ site.data.ui-text[site.locale].search_label_text | default: 'Enter your search term...' }}
     </label>
     <input type="search" id="search" class="search-input" tabindex="-1" placeholder="{{ site.data.ui-text[site.locale].search_placeholder_text | default: 'Enter your search term...' }}" />
   </form>
   <div id="results" class="results"></div>
   {%- when "google" -%}
-  <form onsubmit="return googleCustomSearchExecute();" id="cse-search-box-form-id">
+  <form onsubmit="return googleCustomSearchExecute();" id="cse-search-box-form-id" role="search">
     <label class="sr-only" for="cse-search-input-box-id">
       {{ site.data.ui-text[site.locale].search_label_text | default: 'Enter your search term...' }}
     </label>