r.a.d.spell could be easily localized by switching the "Language" property. Please, note that this will affect the dialog labes, buttons, and error messages, not the spellchecking language.

In the sample above we have placed two TextBoxes and two spell checkers, one localized in English and one localized in French.

The default installation of r.a.d.spell comes with localization files for English, French and German languages. If you want to localize it for your specific language (Hebrew for example) read the manual to learn how to create new localization files. You could also check our Client Extranet (http://www.telerik.com/clientnet) for the latest updates, dictionaries and localization files for new languages.