in src/objects/serverside/utils.js [173:183]
static normalizeGender (gender: string) {
gender = gender.replace(/[^a-z]/g, '');
if (gender === 'female' || gender === 'f') {
gender = 'f';
} else if (gender === 'male' || gender === 'm') {
gender = 'm';
} else { return null; }
return gender;
}