Change the text of password proteced pages

Hello, I want to change the standard wodpress text for password protected pages - in german: "Dieser Inhalt ist passwortgeschützt. Bitte gib unten das Passwort ein, um ihn anzeigen zu können." or disable this text completely. ".nopassword { display: none; }" in the CSS does'nt work. (site is still under construction and actually there is a coming soon activated)