Hello Fabio,
From the NWSSO perspective, customer's can configure their Secure Login Client to login in other languages too by setting the windows registry:
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\SAP\SecureLogin\common]
The STRING Locale will set then the language. Possible values are:
en_US (English)
de_DE (German)
fr_FR (French)
it_IT (Italian)
ja_JP (Japanese)
pt_BR (Portuguese)
ru_RU (Russian)
zh_CN (Chinese)
-> This is described in section 4.3 From the Secure Login Client (NWSSO1.0 release) or section 5.1.1.1 from Master Guide (NWSSO2.0 release).
I hope this clarifies.
Best Regards,
Guilherme de Oliveira.