You can see the issue on https://sr.wikipedia.org/wiki/Papirus_1?veaction=edit (although depending on your font, the text might actually fit). The label should be able to wrap over multiple lines if needed.

Same problem probably affects other context menus (but they have shorter text or only one button, so the problem is not visible).

I would like to mentor this task in Google-Code-in-2018.

Indeed the problem also affects language variant context menus. I just found T188823, I'll merge this task into it.