records: display tabs

(closes #1646)

Signed-off-by: Eirini Psallida <eirini.psallida@cern.ch>
you can remove lines 69-70.
```jinja2
{% if tab.count %}
  {% set tab_count = tab.count() %}
  {% if tab_count %}
    &nbsp;<small class="text-muted">({{ tab_count }})</small>
  {% endif %}
{% endif %}
```