Save button should be primary.

templates/list_verbalfeedback_items.mustache

@@ -932,7 +932,7 @@
                             <input type="hidden" name="sesskey" value="{{ sesskey }}">
                             <label for="inputmaxgrade">{{#str}}grademax, grades{{/str}}</label>
                             <input type="text" id="inputmaxgrade" name="maxgrade" size="4" value="{{ maxgrade }}" class="form-control">
-                            <input type="submit" class="btn btn-secondary ml-1" name="savechanges" value="{{#str}}save, core{{/str}}">
+                            <input type="submit" class="btn btn-primary ml-1" name="savechanges" value="{{#str}}save, core{{/str}}">
                         </fieldset>
                     </form>
                 </div>