Create archiv-fur-die-civilistische-praxis.csl

Some issues in the style guide for this journal are not implemented automatic but have to be handled manually, e.g. "Festschriften" should not mention editors (i.e. delete them manually), pages for journal article should maybe more fuzzy like "328 ff" or what a "Archivzeitschrift" is where volume is shown.
why not use ```<text variable="page-first" suffix=" ff"/>```
I suppose that's wrong for journal articles with 1 or two pages, but that seems quite rare?