Fix: correct answer and dropdown data handling

[Rom1-B]

Checklist before requesting a review

Please delete options that are not relevant.

• I have performed a self-review of my code.
• I have added tests (when available) that prove my fix is effective or that my feature works.
• I have updated the CHANGELOG with a short functional description of the fix or new feature.
• This change requires a documentation update.

Description

• It fixes #N/A
• Some question types could end up storing a value different from the one they are meant to always provide, depending on what was submitted.
  This ensures those questions always return their intended value.
  A dropdown data endpoint was also missing the same access check already applied to similar endpoints, and the directory search autocomplete did not handle some special characters correctly in the search text.

Screenshots (if appropriate):