If you see foreign-language topics in the overview that you do not understand, you can hide them as follows:
Open the tag list:
Select the language that you would like to hide i.e. português-. You will see a circle in the upper right corner, click it and choose “muted” at the bottom.
This has to be done for every language you want to hide and of course it does only work if the topic is tagged in the right way. In the future there will certainly be a better solution.
(This information was already available in the forum but if you are searching for it, you can hardly find it.)