Rename grizzly_bear -> brown_bear

Posted under Tags

The bulk update request #13309 has been approved by @nonamethanks.

create alias grizzly_bear -> brown_bear

Not all brown bear species are grizzlies. For instance, there are Alaskan brown bear, Syrian brown bear, Himalayan brown bear, Kodiak bear and more. People cannot distinguish them at a glance. This suggestion is in order to make the tag more general and versatile.