Перевод - Английский-Хорватский - Last-edited-by

Is it OK like this ?
Is it OK to say "Posljednji uredio Maski" for example ?

Yes. It is male gender, and if you want you can use uredio/la, but male is an accepted "standard" gender on most our forums as well. But if you prefer I can change this one and any possible other into m/f.