[pixiv] Translated tags

[TestPolygon]

The same request as here
#1299 (comment)

[TestPolygon]

What is about removing duplicates?
When there are a translated tag and the same non-translated one.

For examle: https://www.pixiv.net/en/artworks/88605193
For it I get : ["walfas", "walfas tool", "MGSV", "Quiet", "MGS", "MetalGear", "MetalGearSolid", "Quiet", "metal gear solid", "Metal Gear"].

Here "Quiet" is counted twice.
I don't think that it makes sense to store duplicate tags.

[rautamiekka]

Indeed, given

            work["tags"] = [tag[tkey] or tag["name"] for tag in work["tags"]]

does the work, it can be extended to

            work["tags"] = [tag[tkey] or tag["name"] for tag in work["tags"] if tag not in work["tags"]]

, I think.

EDIT: Hmm, thinking about it further, might not work ...