I think that the support resources below will get you started:
Additionally, we will appreciate if you post your localized Japanese versions in our code library under the 'Localization' category linked above. Thus we will reward you with some Telerik points which can be used as a discount for future purchases/upgrades of our AJAX components.
the Telerik team
Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items