Thanks so much for your help Kezia.
I created the word and sound files and thought I used the right settings but it did not work out.
The next day however it worked fine. No idea what I did wrong but it works now.
Anyway, maybe my aproach is not that sensible anyway?
After all the values, operations and symbols are the same just the words for numbers and operators are different for each of the languages.
Does it make more sense to do LM in English only so that DD learns the concept of numbers, counting and math in general and at a later stage just teach her the words in the different languages?