If I look at a comment that was posted on a Hausa Wikipedia talk page seven months ago, I see: "Latest comment: watanni da suka gabata 7}".

The curly brace in the end is unnecessary.

The reason for this is probably that it's written like this in upstream CLDR: https://st.unicode.org/cldr-apps/v#/ha/Fields/header_Relative_Month (see the value of "past-other").

I'm not sure what's the right way to fix it upstream. Perhaps @Nemo_bis knows.

If it can be overridden locally until it's fixed upstream, it can be nice.