Custom theme - variables contained in it

Getting advice
#1

I have created custom theme :slight_smile:
I have few question

image
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templates

  1. When I got above screen, how Can I check if user is logged in (inside code template)? (by variables)
  2. properties.meta?has_content and message?has_content etc… (variables in .ftl)
    When Can I find (for example) this information in keycloak? What they contain?

emails

  1. Where Can i find what contains tokens in translation ? {0} etc…