This shortcode displays button, on click filter in popup appears.
Attributes:
- id: main(required ) attribute, means created on the backend filter ID.
- filter_html_id: Example: 'my_great_filter' - for CSS purposes or programming ones
- title: text of the link
- popup_title: text on the popup header
- class: CSS class of the link, you can set button class of the current wordpress theme