Nefastus vanishing isn't that unusual, he's done it before. So more than likely this isn't actually abandoned.
People take the abandoned tag iteral, which causes more issues than it's worth. People think abandoned means the game is dead, the dev quit, and well, abandoned it.
And in every thread that gets the tag, we have this same "abandoned or not" discussion each time.
So yeah, there needs to be a tag between being on-hold and abandoned. Maybe "Inactive" is a good one. Or "Suspended" or "Paused" or "Dormant".
I don't know why other languages matters, this is an English only site (besides the translation threads).
"Dormant" is probably the best choice. As it's definition is "Inactive but capable of becoming active."
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Which is exactly the area between "Abandoned" and "On-hold" that this site needs.