Hi,
The translation system we have to work without Falang uses the Joomla translation override system and stores the translations in the file language/overrides/xx-XX.overrides.ini
However, Falang stores the translations in the falang_content table of the database.
So that's why you don't see your translations when you uninstall Falang.
And even if we modified the system to be able to load the translations from Falang for the interface, you would still have to edit each product and save the translations in each language as there is no mechanism to process the translations on the frontend (since that's done by Falang).
Ideally, the best would be to have a script to automatically transfer the translations from falang to translation overrides but that's a lot of work.
I see you have only a couple dozen products on your website and two languages. I would recommend to prepare the translation overrides manually and then spend an hour or two changing each product after uninstalling Falang so that you get the translations with the new system.