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Not to state the obvious, but the null hypothesis would be: there's no demand.

English has a whole lot of market-share in the technical world - for better or for worse.

What does the app do? If it's for techies/power users ... all of my desktops and mobile devices have the OS set to English. I simply don't care to see another "creative" translation in my menus.

I think my 70+ mother has her phone set to Romanian. My father... don't think so.

What marketing have you done for this effort? Why would people who speak those languages be aware of your app?

You should do some ASO and content marketing (reviews and etc) for each new language audience.