Seems to me this is feedback for the site owner. If it’s hindering your ability to participate fully, they will want to know. They could organize the topics using tags and categories, so it’s easier to focus on the topics you want to read. Another option would be for them to install the quite lovely official Discourse Translator plugin to allow inline translation which uses automatic machine translation and supports many languages.
If they aren’t interested and other users are not bothered by it, then I guess it’s on you to learn to just tolerate and enjoy the linguistic diversity on the forum, and use google translate to try to figure out what people are saying in other languages and join in conversation with them. 