I've been made aware from some Community users that currently the Samsung Members app seems to be directing non-English speakers to the UK Community for discussions about the One UI/Android Pie Beta.
Unsure the full extent of this, or how long it'll take to fix, but in the meantime here's some links to the main One UI/Android Pie Beta threads on other language European Samsung Community forums to help you get to them.
Also, the official Samsung One UI Global site here lists which countries the Beta will be available in:
Say "Hello!" to the Community in The Introduce Yourself Thread.
As a mod of Polish Samsung Community, I have recently merged the official One UI/Android Pie thread with the one you posted above - just to clarify where users should talk about it
They can still find some useful informations in the old thread, but the main discussion is happening in this one.