Product page > lost data after upgrade

Hi
My Opencart has been updated from 2.0.3 to 2.3.
In the data of my 2600 products I have a few small product problems and I would like to know how I can solve it.

1. On the product general tab> title/discription; the translations are lost. I have 4 languages on my site. Now all languages are a copy of the first standard language.
2. On the product tab Data > Tax Class. Nothing is selected from the dropdown menu, causing all products to have no tax. Tax /Geo-zone has been set up correct. I just need to reconnect my products to the tax class. I only have 1 tax class.
3. On the product tab Data > Out of Stock Status. The status is 'in stock' for all products, even when I have 0 items people see the status 'in stock'.

I have the original database from 2.0.3. opencart containing the translations/stock statuses.
I tried to export /importing "product_discription" from the old to new using myphp, but nothing happend. Can I do this with an export/import using excell / cvs? Or is it not possible and do I have to do it all manually?

you need something like this, to fix your DB (amd probably extensions, if some exist)
Good Luck
Ernie
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https://www.opencart.com/index.php?rout ... n_id=24347
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https://www.opencart.com/index.php?rout ... n_id=19572
https://github.com/pekka2/OpenCart-Migr ... grade-Tool
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https://www.opencart.com/index.php?rout ... n_id=16464