YOu can write it in less lines
lcd.home(); //Grafoume THERMOKRASIA
// lcd.setCursor(0,0);
lcd.print("TEPMOKPASIA:"); // just write the whole word with placeholders (preferably some that make sense)
lcd.setCursor(0,0);
lcd.write(0); // write ?
lcd.setCursor(8,0);
lcd.write(1); // write ?
33% less lines and easily testable without the greek chars