Issue #3314446: Use button instead of "submit" input

templates/insert-button-widget.html.twig

@@ -17,4 +17,4 @@
   <input type="hidden" class="insert-style" value="{{ insert.default_style }}" />
 {% endif %}
 
-<span class="insert-button-wrapper"><input type="submit" class="button js-form-submit form-submit insert-button" onclick="return false;" value="{{ 'Insert'|trans }}" data-insert-id="{{ insert.id }}" /></span>
\ No newline at end of file
+<span class="insert-button-wrapper"><button class="button js-form-submit form-submit insert-button" data-insert-id="{{ insert.id }}">{{ 'Insert'|trans }}</button></span>
\ No newline at end of file