remove useless aria-controls from tabset link
<ul class="nav{% if css_classes %} {{ css_classes }}{% endif %}"{% if inline_styles %} style="{{ inline_styles }}"{% endif %} role="tablist">
{% for pane in instance.child_plugin_instances %}
<li class="nav-item">
- <a class="nav-link{% if forloop.first %} active{% endif %}" href="#cmsplugin_{{ pane.id }}" aria-controls="{{ pane.glossary.tab_title|lower }}" role="tab" data-toggle="tab">
+ <a class="nav-link{% if forloop.first %} active{% endif %}" href="#cmsplugin_{{ pane.id }}" role="tab" data-toggle="tab">
{{ pane.glossary.tab_title|safe }}
</a>
</li>
