void webkit_web_context_set_spell_checking_languages ( WebKitWebContext* context, const gchar* const* languages )
Set the list of spell checking languages to be used for spell checking.
The locale string typically is in the form lang_COUNTRY, where lang is an ISO-639 language code, and COUNTRY is an ISO-3166 country code. For instance, sv_FI for Swedish as written in Finland or pt_BR for Portuguese as written in Brazil.
You need to call this function with a valid list of languages at least once in order to properly enable the spell checking feature in WebKit.