authenticate user after their reset confirmation goes through

make password validation code more DRY

grammar nit: "less" -> "fewer"

common/djangoapps/util/password_policy_validators.py

@@ -15,6 +15,26 @@ from django.conf import settings
 import nltk
 
 
+def validate_password_strength(value):
+    """
+    This function loops through each validator defined in this file
+    and applies it to a user's proposed password
+
+    Args:
+        value: a user's proposed password
+
+    Returns: None, but raises a ValidationError if the proposed password
+        fails any one of the validators in password_validators
+    """
+    password_validators = [
+        validate_password_length,
+        validate_password_complexity,
+        validate_password_dictionary,
+    ]
+    for validator in password_validators:
+        validator(value)
+
+
 def validate_password_length(value):
     """
     Validator that enforces minimum length of a password
@@ -28,7 +48,7 @@ def validate_password_length(value):
     if min_length and len(value) < min_length:
         raise ValidationError(message.format(_("must be {0} characters or more").format(min_length)), code=code)
     elif max_length and len(value) > max_length:
-        raise ValidationError(message.format(_("must be {0} characters or less").format(max_length)), code=code)
+        raise ValidationError(message.format(_("must be {0} characters or fewer").format(max_length)), code=code)
 
 
 def validate_password_complexity(value):