After T339103: Show MUL as last language in Termbox if any MUL terms exist is done, we should introduce a feature flag which, when enabled, will cause mul to always be shown as the last language in the “in more languages” section of the desktop termbox, regardless of whether there are any existing mul terms or not.
This means that the “soft rollout” of T316767 is the default behavior, and the new feature flag is used to opt out of the soft rollout into the “after soft rollout” phase.
This feature flag will be toggled in production in context of T312176.
It will be removed from our code base again in context of T330217.