translation: mark vim.pot as linguist-generated, ignore msg locations in vim.pot

translation: mark vim.pot as linguist-generated, ignore msg locations in vim.pot

Update the textconv filter to filter out changes in the comments
pointing to the location of the message.

Also remove the comments in vim.pot that mention the message location.
Since those will be ignored using vims textconv filter, it does not make
sense to keep them, they would get out of sync anyhow.

closes: #17782

Co-authored-by: Illia Bobyr <illia.bobyr@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>