ycb_django_pr13794

what a new run launched now would send

add filter is unable to concatenate strings with lazy string
Description
	
If you try to concatenate a string with a lazy string with the add template filter, the result is always the empty string because the add filter generates an exception (TypeError: can only concatenate str (not "__proxy__") to str).

Work only inside this repository checkout. Make the code change the task
describes, keeping the diff focused — no drive-by refactors.

When you are done, leave your changes committed or in the working tree;
they are collected automatically.

Stay on this snapshot checkout (`task/ycb_django_pr13794`). Never checkout, pull, or rebase onto `main`. That branch is a README-only orphan.
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Some past runs of this task were launched with a different prompt (the prompt template changed since, or those runs predate this benchmark's stored prompt). Each run persists the exact prompt it sent at launch — that per-launch record is the audit trail; this page shows only the current one.