Adding my 2cents.
I don’t why this is an issue, the mentioned topic was created in Jan 19, 2023 6:59 PM, isn’t the only one in a non-english language. And it wasn’t the first one. Just in top on my mind, there are other local languages topics. For example:
Created in Nov 9, 2020 9:11 AM:
Maybe this is weird for english speaking people not used to other languages. Or just to people that joined a couple months ago, and don’t know the community.
The mentioned topic is aimed for Portuguese-speaking people, hundreds of millions across the globe [Note 1], specially those in Portugal or with links to Portugal, including those interested in investing in Portuguese markets.
Resuming, the goals were to dinamize the Portuguese community and Portuguese stock exchange, that was launched a couple weeks before the mentioned topic was created:
Btw, the mentioned topic had several interactions with the great T212 team members, although they maybe don’t understand Portuguese, they were able to monitoring it and intervene if they want to. 
Last, but not the least, most web browsers (PC/MAC/mobile) had built-in options to translate the web pages.
PS: Btw, there are lots of topics specific for UK customers, that most non-UK customers don’t care about, and you don’t see anyone complaining. The topics can be selected or ignored by anyone.
[Note 1]
Source: Portuguese language - Wikipedia