I tried to install this, but I failed so far
[ERR] switch_ivr_play_say.c:113 Can't find language de.
[WARNING] switch_ivr_play_say.c:339 Macro [voicemail_hello]: '' did
not match any patterns
well, you didn't load mod_say_de
i have EN, DE, FR, HR, IT, RU languages working fine
anyhow, to add a new language
edit freeswitch.xml and add your language within phrase section