Search icon rather than text

InvenTree/templates/search_form.html

@@ -3,5 +3,5 @@
     <div class="form-group">
         <input type="text" name='search' class="form-control" placeholder="Search"{% if query_text %} value="{{ query }}"{% endif %}>
     </div>
-    <button type="submit" id='search-submit' class="btn btn-default">Search</button>
+    <button type="submit" id='search-submit' class="btn btn-default"><span class='fas fa-search'></span></button>
 </form>