Brown mittens and fur-trimmed mittens

The bulk update request #14854 has been approved by @nonamethanks.

create implication brown_mittens -> mittens
create implication fur-trimmed_mittens -> mittens

Brown mittens and fur-trimmed mittens by their nature imply the existence of mittens.

This bulk update request is pending automatic rejection in 5 days.

The bulk update request #14854 (forum #232131) has been approved by @nonamethanks.