reStructuredText (.rst) files with special characters are not rendered

Summary

.rSt files containing special characters like umlauts are not rendered as HTML.

Steps to reproduce

  1. Create/choose a repository
  2. Add special characters to a README.rst file, e.g. ä, ö, ü or ß
  3. View README.rst in the gitlab file browser.

Expected behavior

README.rst is rendered as HTML.

Actual behaviour

README.rst is not rendered as HTML (see screenshot below).

Relevant logs and/or screenshots

rSt-not-rendered

Output of checks

Results of GitLab application Check

GitLab-application-check.txt

Results of GitLab environment info

GitLab-environment-info.txt

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