register: use ModelForm, and print all errors

accounts/forms/change_password.py

@@ -1,7 +1,10 @@
 from django import forms
-from ..settings import *
+from django.contrib.auth.models import User
+from django.contrib.auth import authenticate
 
+from ..status_code import *
+    
 class ChangePasswordForm(forms.Form):
-    username = forms.CharField(label="username", max_length=USERNAME_MAX_SIZE, min_length=USERNAME_MIN_SIZE, required=True)
-    current_password = forms.CharField(label="current_password", max_length=PASSWORD_MAX_SIZE, min_length=PASSWORD_MIN_SIZE, required=True)
-    new_password = forms.CharField(label="new_password", max_length=PASSWORD_MAX_SIZE, min_length=PASSWORD_MIN_SIZE, required=True)
+    new_password = forms.CharField(required=True, error_messages = {
+            'required': PASSWORD_MISSING,
+    })