Translate error message, simplify error handling

[tschorr]

RegistrationTool.pasValidation expects translated error messages, however the password policy plugin doesn't translate the minimum length error message. Also simplify the error handling.

This is a follow up to plone/plone.restapi#1630 - the idea is to use the correctly rendered error message for display in Volto's PasswordReset.jsx (without this fix, the actual value of min_chars will not be rendered).

[mister-roboto]

@tschorr thanks for creating this Pull Request and helping to improve Plone!

TL;DR: Finish pushing changes, pass all other checks, then paste a comment:

@jenkins-plone-org please run jobs

To ensure that these changes do not break other parts of Plone, the Plone test suite matrix needs to pass, but it takes 30-60 min. Other CI checks are usually much faster and the Plone Jenkins resources are limited, so when done pushing changes and all other checks pass either start all Jenkins PR jobs yourself, or simply add the comment above in this PR to start all the jobs automatically.

Happy hacking!

[tschorr]

@jenkins-plone-org please run jobs

[tschorr]

Jenkins failures are actually meaningful:

Failure in test testPasValidation (Products.CMFPlone.tests.testRegistrationTool.TestRegistrationTool.testPasValidation)
Traceback (most recent call last):
  File "/srv/python3.11/lib/python3.11/unittest/case.py", line 57, in testPartExecutor
    yield
  File "/srv/python3.11/lib/python3.11/unittest/case.py", line 623, in run
    self._callTestMethod(testMethod)
  File "/srv/python3.11/lib/python3.11/unittest/case.py", line 579, in _callTestMethod
    if method() is not None:
  File "/home/jenkins/workspace/pull-request-6.1-3.11/src/Products.CMFPlone/Products/CMFPlone/tests/testRegistrationTool.py", line 150, in testPasValidation
    self.assertEqual(
  File "/srv/python3.11/lib/python3.11/unittest/case.py", line 873, in assertEqual
    assertion_func(first, second, msg=msg)
  File "/srv/python3.11/lib/python3.11/unittest/case.py", line 1253, in assertMultiLineEqual
    self.fail(self._formatMessage(msg, standardMsg))
  File "/srv/python3.11/lib/python3.11/unittest/case.py", line 703, in fail
    raise self.failureException(msg)
AssertionError: 'Your password must contain at least 8 characters.' != 'Your password must contain at least ${min_chars} characters.'
- Your password must contain at least 8 characters.
?                                     ^
+ Your password must contain at least ${min_chars} characters.
?                                     ^^^^^^^^^^^^

-> test is assuming the incorrect error message, we need to fix the test after merging this PR.

[davisagli]

@tschorr Thanks for working on this. I think there's one thing missing...

[jensens]

@jenkins-plone-org please run jobs