copilot-swe-agent[bot]
0592c59174
The error templates (404.html, 500.html) extend base.html which uses
{{ suggested_languages | tojson }} in the language selector dropdown.
The _error_templates instance in app/main.py was missing this global,
causing Jinja2 Undefined objects to be passed to the tojson filter,
resulting in "TypeError: Object of type Undefined is not JSON serializable"
errors in 35 tests.
Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>