Gmail spellchecker

Gmail's spellchecker isn't working right. Since I write a fair amount of emails in Dutch, I set the spellchecker to 'Nederlands'. However it isn't working as expected. Common Dutch words are flagged as incorrect. Some suggestions are actually in English.

Request for Enhancement: It would be useful if one could specify the preferred language of the recipient in the Contacts section. One wouldn't need to set the spellchecker language manually for every email. Or better even, perhaps the Googlebot could deduce than language from previously written emails.