Are there any libraries people are using for handling multiple languages in your app??

ResourceBundle

from the Java land not working for you in desktop, or are you looking for a multi-platform solution?

multiplatform 😛

there is https://github.com/adrielcafe/lyricist

this looks very promising

note that I haven't used it -- I just remembered it from a past issue of my newsletter

Well, the library lyricist hasn’t seen any new releases for months and it also doesn’t support iOS. So, depending on what you want to do it may not be the right choice. I’d rather have a look at https://github.com/icerockdev/moko-resources