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It's been a while for INTerpalore being a multilingual website, but the forums here only use English however.
Here are the languages in order by release date:
Spanish - February 15th, 2022
French - February 17th, 2022
Japanese - February 17th, 2022
Italian - February 17th, 2022
German - May 24th, 2022
Portuguese - June 20th, 2022
Dutch - July 20th, 2022
Korean - July 20th, 2022
Chinese - July 22nd, 2022
Swedish - July 23rd, 2022
Bulgarian - August 2nd, 2022
Polish - August 2nd, 2022
Greek - August 5th, 2022
Arabic and Russian were planned to be in the site alongside Korean and Chinese, but were replaced by Dutch and Swedish.