Issues written in languages other than English, such as #26979, require
manual translation before the development team can triage them.
This adds an `Issue Translator` workflow that uses Codex when an issue
is opened. For non-English reports, it replaces the title with an
English translation, preserves the original body, and posts the
translated body as an idempotent issue comment.
The translation scripts were run manually against non-English issue
content and produced the expected English title and comment output.
Eric Traut