Password change fails with character '+' that form states is allowable

Description Stork will refuse to validate passwords using the plus sign, one of the characters the password change screen explicitly states is an allowed special character.

To Reproduce

1. visit /profile/password page for password change
2. In both password and confirm password boxes type: abc+123
3. Password box will error out with an allowed characters message and confirm box will error out stating passwords don't match

Expected behavior Any characters which cause password processing errors should be removed from acceptable character lists.

Environment:

• Stork: 1.14.0
• OS: unknown, my apologies (I'm an end user)
• Kea version: unknown
• BIND9 version: unknown

Additional Information This is possibly related to issue #1246 if the db password is processed in the same fashion.