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Limit Spellchecker Languages

If you don’t want your spellchecker dropdown to be too big, you can limit the available languages. Cut it down to only a few, or even just one.

add_filter('mce_spellchecker_languages', 'limit_spellchecker_languages');
function limit_spellchecker_languages() {
	//original: +English=en,Danish=da,Dutch=nl,Finnish=fi,French=fr,German=de,Italian=it,Polish=pl,Portuguese=pt,Spanish=es,Swedish=sv
	return '+English=en';
}