[PF-21] Strengthen append-i18n prompt for plan language detection

[chucoding]

Purpose

Clarify how the plan’s output language is chosen so that code snippets and technical identifiers (often in English) do not cause the plan to be written in English when the user’s main language is something else (e.g. Korean).

Description

• packages/core/prompts/append-i18n.md

  • Kept the existing instruction: write the entire plan in the same language as the user’s goal.
  • Added a “Determining the target language” block with four rules:
    1. Exclude from detection: English from code snippets, variable/function names, file paths, technical identifiers, or copied text must not alone decide the language.
    2. Natural language only: Among the natural-language parts of the user’s goal, the target is the most frequently used language.
    3. All-English case: If the goal is entirely in English as natural language, then English is the target.
    4. Mixed content: Do not treat “mixed with code” as “English goal”; prefer the user’s main natural language when it is clearly present.

• Notion (다국어 지원)
  Documented this change in a new section “4. 계획서 언어 결정(append-i18n) 보강” (background, rules table, and modified file).

How to test

1. Run plan with a goal that mixes Korean (or another language) natural text and English code/identifiers (e.g. file paths, function foo()).
2. Confirm the generated plan (headings and body) is in the user’s main natural language (e.g. Korean), not in English.
3. Run plan with a goal written fully in English; confirm the plan is in English.

Review Requirement

• Check that the new bullets in append-i18n.md are clear and that the “exclude code/identifiers” rule is easy to apply for model behavior.

Additional Info

• Related Notion: 🌎 다국어 지원

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