If your target audience is international but you can reasonably expect them to speak your language but to search in their native tongue, OK, this makes sense. But that's a large target for a small segment.
Localization is a process that involves your translator understanding your product, the terms it uses, the context in which it uses them, and how those terms can be transitioned into their target language. That's a far cry from keywords and descriptions, and it matters in many cases. Those cases never stop at $300.
It's often worth doing (this is totally dependent on your goals, though) but in the case that it's worth doing for you, it's also worth deciding whether you want to actually do it or whether just making sure people find your app is OK or whether you want them to be able to use it in their native language. Huge difference.