disable autocorrect and autocapitalize for search (bug 890569)

Author: cvan

hearth/templates/header.html

@@ -6,7 +6,7 @@ <h1 class="site"><a href="{{ url('homepage') }}"><span class="wordmark">Firefox
     <label for="search-q">{{ _('Search') }}</label>
     <div id="site-search-suggestions" data-src=""></div>
     <input id="search-q" class="query-input" type="search" name="q" title=""
-         autocomplete="off" placeholder="{{ _('Search') }}" required
+         autocapitalize="off" autocomplete="off" autocorrect="off" placeholder="{{ _('Search') }}" required
          value="{{ z.context.search or '' }}">
     <a href="#" class="close search-clear" title="{{ _('Clear') }}">{{ _('Clear') }}</a>
   </form>