Hi JoTse! Little Math Basic already comes with access to the software's PRO features, so you don't need to buy the PRO Key separately anymore.
There are a few voice and word sets in different languages included in Little Math. You can check them in Little Math's Media Library screen ("Voice Sets" and "Word Sets" tab).
If the language you need is not there, you can make your own (record your own voice saying the numbers and create a voice set). For detailed instructions on how to make your own voice set and word set, see:
http://support.brillkids.com/hc/en-us/articles/204596764-How-to-teach-numbers-and-math-in-a-different-languageOR you can download some media sets from the BrillKids Library (created and shared by other Little Math users). You can access the library through Little Math's Download screen, or via browser:
http://library.brillkids.com.