/series/add: support for Zagorski catalogue

[php-coder]

In Russian: https://ru.wikipedia.org/wiki/%D0%A1%D1%82%D0%B0%D0%BD%D0%B4%D0%B0%D1%80%D1%82-%D0%9A%D0%BE%D0%BB%D0%BB%D0%B5%D0%BA%D1%86%D0%B8%D1%8F_(%D0%BA%D0%B0%D1%82%D0%B0%D0%BB%D0%BE%D0%B3_%D0%BC%D0%B0%D1%80%D0%BE%D0%BA)

[0pdd]

@php-coder 2 puzzles #773, #775 are still not solved; solved: #776, #809, #810.