It does look correct when displayed in a web browser, or not? I confirm the actual html file looks like you said, but the browser gives me a page like the attached screenshot (never mind it says "xenial" there, it's a bionic container, I just made a mistake with the hostname).
** Attachment added: "mailman-bionic.png" https://bugs.launchpad.net/debian/+source/mailman/+bug/1777349/+attachment/5154290/+files/mailman-bionic.png -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1777349 Title: Broken encoding in Russian-translated HTML templates To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mailman/+bug/1777349/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs