"Topics" navigation bar on the left resets the language

Steps to reproduce:

Visit https://support.torproject.org/, pick a language from the menu on the right. Or, just visit a language other than English directly, like https://support.torproject.org/de/. Then click on any of the topics on the left.

Actual Result:

The support portal language resets to English.

Expected Result:

The support portal language should respect the selected language and should not reset to English.