Shows a form for email subscribe to a group.

• template_id (optional): use a predefined format template for the form (see below).

If no template id is given, a default form layout will be used instead.
If you use a template for this shortcode, the placeholders mentioned below can be used:

• #_EMAIL asks for the email (required)
• #_MAILGROUPS displays a list of EME groups designated as “email only” a person can subscribe to. This “email only” option can be selected when you create/edit an EME group.
• #_GDPR (optional) asks for confirmation to store your info
• #_GDPR{} (optional) asks for confirmation to store your info with between the braces the text you want as extra label text for the field
• #_SUBMIT{} displays displays the submit button with between the braces the text you want for the button (qtranslate compatible).
• #_SUBMIT displays displays the submit button with the text you want for the button the text configured on the Settings page.
• #_CAPTCHA displays the captcha part
• #_RECAPTCHA (*) required if Google reCAPTCHA is configured to be used.

#_EMAIL and #_SUBMIT are required, and also #_CAPTCHA if the captcha option is activated