Mediafire Download Link: Populous: The Beginning Language Pack

Extract the "language" folder to your Populous 3 directory and overwrite the files.

Go to the following location in your registery:

Computer\HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Bullfrog Productions Ltd\Populous: The Beginning

Double click the "Language" DWORD, click "Decimal" and change to one of the numbers below:

English: 9
Dutch: 19
French: 1036
German: 7
Spanish: 10
Swedish: 29
Polish: 21

This is what it should show after entering the number:

English: 0x00000009 (9)
Dutch: 0x00000013 (19)
French: 0x0000040c (1036)
German: 0x00000007 (7)
Spanish: 0x0000000a (10)
Swedish: 0x0000001d (29)
Polish: 0x00000015 (21)

*** Undiscovered Worlds will still be in english for some languages as it had limited language support ***

...after 3 years, italian language exist?

No, this was never made for the game.

The ones provided are just the ones that shipped with my boxed copy of the game.

This tips has working for French language! Merci =)