[Resolved] Links and buttons not switching to correct language version

Background of the issue:
I'm trying to ensure that all internal links on my site, including buttons and menu items, automatically point to the correct language version of the page depending on the selected language. My site is hidden link.

Symptoms:
On the front page, buttons are showing Swedish text and linking to the Swedish versions of the pages even when I switch to English, instead of linking to the /en/ versions.

Questions:
How can I make sure that all internal links automatically point to the correct version of the page depending on the selected language?