You cannot really do an IVR scripting on Quintums. Although you can connect Cisco gateway to your T1 line and create a simple TCL IVR scirpt, which will ask for the language selection – and then route the call to Quintum GW1 or GW2.
Quintum only gives you quasi multi-language support – about nine languages which are supported. If you need some other language (e.g. Czech) – you’re out of luck. On Cisco you can at least get a text-to-speech module for a new language from the third party or write your own.
You forget about genders, cases and the other language elements. If you just replace english prompts with Czech ones – you will get “me talk english very poor” sort of IVR. Probably in most cases your customer can figure out what you meant, but it will sound confusing and extremely unprofessional.