[GrandComicsDatabase/gcd-django] prevent deleting of character names with story appearance (Issue #509)

[JochenGCD]

For Creators there is a note under each name that cannot be deleted:
Creator names with existing credits cannot be removed.

This needs to be done for characters as well.

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[JochenGCD]

Ideally not show the 'remove' link in such a case (needs JavaScript)