[GinS] Add query string option

templates/explore/search_ext.tmpl

@@ -3,8 +3,9 @@
 		<input name="q" value="{{.Keyword}}" placeholder="{{.i18n.Tr " explore.search"}}..." autofocus>
 		<select class="ui dropdown" name="stype" id="search-type-select">
 			<option value="0">Match</option>
-			<option value="1">Fuzzy</option>
-			<option value="2">Wildcard</option>
+			<option value="1">Fuzzy Term</option>
+			<option value="2">Wildcard Term</option>
+			<option value="3">Querry String</option>
 		</select>
 		<button class="ui blue button">{{.i18n.Tr "explore.search"}}</button>
 	</div>