There is a user preference option to enable spell checking in comment and text areas for users who want to enable that functionality. xTuple uses the widely-adopted, open source Hunspell spell checker as the basis for its spell checking feature.
To be functional, the spell checker requires that Hunspell dictionary files be installed in the xTuple executable directory. By default, the English dictionary files (English.dict and English.aff) are distributed with the product. However, Hunspell dictionaries for other languages are also available for download from many sites on the Internet.
The spell checking feature has been designed to operate with a user's Locale settings—which means that if you are using a locale other than English (and you have the correct Hunspell dictionary files installed) the spell checker should work in your specified language.