By default SCAYT treats the text written in the editor as American English (en_US). If you want to change the default SCAYT language, set the scayt_sLang configuration value to one of the 16 possible language codes that are currently accepted.
// Sets SCAYT to French. config.scayt_sLang = 'fr_FR';
These are the language codes of languages currently supported by SCAYT: en_US, en_GB, pt_BR, da_DK, nl_NL, en_CA, fi_FI, fr_FR, fr_CA, de_DE, el_GR, it_IT, nb_NO, pt_PT, es_ES, and sv_SE. If you enter a language code that is not supported, SCAYT will fall back to default American English.