Template support for `COMMENTS_HIDE_REMOVED`

[vdboor]

https://django-contrib-comments.readthedocs.io/en/latest/settings.html

When COMMENTS_HIDE_REMOVED = True the comments can be shown as "This comment was removed"

[tisdall]

I read the docs as saying COMMENTS_HIDE_REMOVED = True means the removed comments are not shown (the default). If COMMENTS_HIDE_REMOVED = False then you show "This comment was removed".