While iOS application can be translated to a great number of languages (and even custom ones),   iTunes Connect supports a small subset of those.

 

Here’s the full list:

  1. English (U.S.) (en-US)
  2. Chinese (Simplified) (zh-Hans)
  3. Chinese (Traditional) (zh-Hant)
  4. Danish (da)
  5. Dutch (nl-NL)
  6. English (Australia) (en-AU)
  7. English (Canada) (en-CA)
  8. English (U.K.) (en-GB)
  9. Finnish (fi)
  10. French (fr-FR)
  11. French (Canada) (fr-CA)
  12. German (de-DE)
  13. Greek (el)
  14. Indonesian (id)
  15. Italian (it)
  16. Japanese (ja)
  17. Korean (ko)
  18. Malay (ms)
  19. Norwegian (no)
  20. Portuguese (Brazil) (pt-BR)
  21. Portuguese (Portugal) (pt-PT)
  22. Russian (ru)
  23. Spanish (Mexico) (es-MX)
  24. Spanish (Spain) (es-ES)
  25. Swedish (sv)
  26. Thai (th)
  27. Turkish (tr)
  28. Vietnamese (vi)
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