@yacin you can manually choose to change this settings:
security.password.user.strength
-1: disabled completely the check
0 : alert if listed in common password
1 : 8 letters minimum, alert if listed in common password
2 : 8 letters minimum, digit, lower and upper, alert if listed in common password
3: 8-letters minimum, digit, lower, upper, and other characters, alert if listed in common password
4: 12-letters minimum, digit, lower, upper, and other characters, alert if listed in common password
To do that:
yunohost settings set security.password.user.strength -v 2
You can change the password policy for admin too:
security.password.admin.strength