TheTVDB.com

Here is a list of Language ID codes
They go at the end of the link
http://thetvdb.com/?tab=series&id=152831&lid=7 (the 7 corresponding with English)
http://thetvdb.com/?tab=series&id=152831&lid=16 (the 16 corresponding with Espanol)

English is 7
Nederlands is 13
Español is 16
Magyar is 19
(russian) is 22
Portugues is 26
Dansk is 10
Slovenski is 30
Deutsch is 14
Francais is 17
(greek) is 20
(hebrew) is 24
cestina is 28
Hrvatski is 31
Suomeksi is 11
Italiano is 15
Polski is 18
Turkçe is 21
(Jap) is 25
(Chin han) is 27
(Korean) is 32
Svenska is 08
Norsk is 09

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I would like to add all Serbian names for all episodes of SpongeBob SquarePants, but I'm not able to add it, because there is no Serbian language (ID). Help?

We've got no solution for you right now. We aren't adding any more languages to this site until we can finish the new one (no ETA). The current system has issues and adding more languages just isn't practical. Once we get the new site done we'll support all languages (anything with an ISO code) but for now our site is limited to the listed languages.

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Please don't PM me. Post in the forums instead unless there is a very good reason for a PM or I won't answer you.