It can help. At times my company has sought experts on varying threat actors.
Sometimes studying these come with language needs based on the actors’ origin (Russian, Chinese, Farsi, Korean, etc.). While not technically a requirement, it can make things harder when tracking, reversing, etc if you don’t speak the language.
Looking at the current threat landscape and where things often come from Russian or Chinese would be very useful. Looking beyond security, I’d ask if a one language or another in particular is useful or interesting to you.
