Feature Description

For parsing and rendering the story markup in the correct way, we use mb_convert_encoding to fix the encoding if needed. That function is part of the mbstring extension which can be missing or outdated on certain servers.

We can include https://github.com/symfony/polyfill-mbstring/ as a polyfill for these cases.

This should reduce the number of support requests where users report mangled umlauts due to inproper encoding.

Setup should be straightforward:

1. composer require symfony/polyfill-mbstring
2. Update scoper.inc.php to prefix symfony/polyfill-mbstring dependencies correctly

Alternatives Considered

Additional Context

Related: #4859, #4791

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Acceptance Criteria

Implementation Brief