QFont toString() method local language problem

When I try to convert a QFont to string with method of toString() , Font Style section of the string is corrupted when it has a non-English character. As in pictures I attached, the word Bold is Kalın in Turkish and the non-English character 'ı' is converted to many irrevelant characters. There is no problem with converting from this string with fromString() method, but because I save this information to a file, file size gets bigger and bigger. Also there is no way to convert this corrupted string to unicode.