http://pod.nicode.net/gold/gog/

The following archives can be extracted into the game folder to add a language:
* podgoldf.zip French 7.21 MiB (7,562,093 bytes)
* podgoldi.zip Italian 7.17 MiB (7,526,626 bytes)
* podgoldg.zip German 7.28 MiB (7,636,736 bytes)
* podgolds.zip Spanish 7.16 MiB (7,510,034 bytes)

The game language can be changed in the <pod_gold_gog>\UBISOFT\ubi.ini.

On Windows Vista or newer you should have a look at the %LocalAppData%\VirtualStore directory (the Microsoft Windows Application Compatibility shims might/will virtualize the write access because %ProgramFiles%, %ProgramFiles(x86)%, and %windir% are read-only by default).

The archives have been created by extracting the language specific files from the following POD patches:

* French [url=ftp://ftp.ubisoft.com/PodUpgrade/pod1x2fr.zip]pod1x2fr.zip[/url] + [url=ftp://ftp.ubisoft.com/PodUpgrade/Patches/3dfx/updatePOD21_3dfx.exe]updatePOD21_3dfx.exe[/url]
* Italian 10x21i.exe
* German [url=ftp://ftp.ubi.com/de/pod/pod_update_mmx_bundle10to12.zip]pod_update_mmx_bundle10to12.zip[/url]
* Spanish [url=ftp://ftp.ubisoft.com/PodUpgrade/Patches/update-mmx-bunddle/spanish/10x21S.exe]10x21S.exe[/url]

The case of the file names has been changed to support installations on Linux (Wine).

I reinstalled the game on Win10 and Italian patch doesn't work anymore: the game says "Insert CD-ROM".