[Resolved] Translation of GravityForms strings

Background of the issue:
Background of the issue:
I would like to target the strings inside a custom HTML email template. A template is being used in GravityForms to override the HTML style of the outgoing email HTML.
Here is a snippet of that code, including the strings
This is an example of my code:
Fake Address 101
0011 AB Netherlands
T — 030 21 203 54
W — test-domain.com
How do I mark these strings so that I can load them in my WPML editor and translate them? So to be clear, I have a template like this:

add_filter( 'gform_html_message_template_pre_send_email', 'notification_template' );
function notification_template( $template ) {
$template = '
{subject}
{message}
';
return $template;
}

And inside the body, I have a email signature that I would like to have translated. I found this documentation: https://wpml.org/documentation/support/enabling-text-translation-for-themes-not-compatible-with-wpml/ but is it as easy as doing this:
Here’s how you can make the code ready for translation with WPML by replacing the actual text with placeholder dummy text while ensuring the strings are translation-ready:

Symptoms:
I am struggling with preparing my custom HTML template to be translatable. I can use the {message} field inside GravityForms but want to make it clean without HTML inside that message tab. I also struggle with targeting the right text-domain, as GravityForms generates a text domain for each form.

Questions:
How do I target all the forms (text-domain) without needing to target each form individually with the _1 addition?
How do I prepare my HTML code so it is ready for translation?