Rename Grizzly MKV -> Grizzly Win Mag

BUR #15597 has been approved by @nonamethanks.

rename grizzly_mkv -> grizzly_win_mag

It's too calibre-specific, because Grizzly MKV is the .50 cal variant of the Grizzly Win Mag. Visually speaking, all the handgun variants generally look like M1911 with longer protruding barrel. Sometimes Girls' Frontline character name should not fully influence how the weapon tag should be named after. This tag should also be usable outside 少女前線 context, but still maintaining technicality while still covering more-specific variants.
For the similar reason we have Mauser 98 tag that covers all variants in general, but not Kar98k.

The Wikipedia page said the following:

and the Mark V was designed to chamber the still more potent .50 AE.

Please check the following BURs too:
topic #23404, topic #23336, forum #234774, topic #23409, topic #23421

This is going to be unnecessary in my opinion. While yes there is more than one variant of the Grizzly, Grizzly is the only character to be seen with the handgun in question.
Oh and the M98 covers all the variant.

I'm going to approve this to be in line with Wikipedia, and because we shouldn't base our tags on specific copyrights. You never know what kind of artwork will be uploaded, so it doesn't make much sense to have the specific model as main tag usually.

The bulk update request #15597 (forum #235303) has been approved by @nonamethanks.

BUR #16381 has been approved by @nonamethanks.

create alias grizzly_mkv -> grizzly_win_mag

Meant this to be an alias.

The bulk update request #16381 (forum #239404) has been approved by @nonamethanks.

nonamethanks said:

I'm going to approve this to be in line with Wikipedia, and because we shouldn't base our tags on specific copyrights. You never know what kind of artwork will be uploaded, so it doesn't make much sense to have the specific model as main tag usually.

For the same reason we have a character HP-35 (Girls' Frontline), yet we agreed to use the most commonly recognized and official real life Browning Hi-Power model tag.
I appreciate that and agreed with your supportive statements. Thank you in advance for your tremendous effort and hard work regarding such issues.