I found out that there seems to be a problem with typical variables (the $-ones) within twig-templates. However: on my template the company-logo won’t be shown (neither in the preview nor when I run the template). Same to the font-variabes and so on.
Oh, and ain’t there a page-number-option for templates?
Mh, but yesterday/today @david advised me to use them in another topic (quote-template in this case) on github. But for the sake of completeness I have to mention he also told me NOT to use them within the ninja-code.
And this makes sense as long as not all $-variables are available as twig-variables. Otherwise one cannot link to the company-logo and so on.