I think there's a confusion. What does the language in which a game is available have to do with paying taxes? And is there an equivalent to VAT in Japan or Korea?
Viewing post in Is itch.io handling VAT with Asian countries?
Yes, South Korea asks for a VAT report and I have done that for steam.
Normally the online store should be handling VAT so I don't have to worry about it.
But I am just checking because I will be reporting to South Korean tax authority, that I earned money from South Korean customers by selling software through itch.io and itch.io paid VAT.
I talked about the language support, because if I support those languages then there will be buyers from the countries with first language as Korean or Japanese.