A form was submitted in the %S encoding which cannot encode all Unicode characters, so user input may get corrupted. To avoid this problem, the page should be changed so that the form is submitted in the UTF-8 encoding either by changing the encoding of the page itself to UTF-8 or by specifying accept-charset=utf-8 on the form element.
Unvióse un formulariu na codificación %S que nun pue codificar tolos caráuteres d'Unicode, polo que la entrada del usuariu pue tar frañada. Pa evitar esti problema, hai de camudar la páxina pa que s'unvie'l formulariu na codificación UTF-8, yá seya camudando la codificación de la propia páxina a UTF-8 o especificando accept-charset=utf-8 sobre l'elementu del formulariu.