fix: translate template section headings to target language for non-English users

[devin-ai-integration]

fix: instruct LLM to translate section headings for non-English users

Summary

Adds a prompt instruction in the non-English conditional block of enhance.system.md.jinja telling the LLM to translate template section headings into the user's language. This addresses a report that when using Mistral in German, the enhanced note section headings stayed in English while the body content was correctly in German.

The change is a single line in the system prompt, gated behind {% if !(language|is_english) %}.

Review & Testing Checklist for Human

• The instruction assumes templates are always authored in English ("Template section titles are provided in English for reference only"). If users can create templates with non-English titles, this wording could confuse the LLM into "translating" already-correct headings. Consider whether the wording should be softened.
• Test with Mistral + German (the original reporter's setup) to verify headings are actually translated in the generated output. Unit tests only validate template rendering, not LLM behavior.
• Verify the instruction doesn't cause regressions with other non-English languages (e.g., Korean, French) where heading translation was already working acceptably.

Notes

• Requested by: @ComputelessComputer
• Devin session

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