fix: present extension opt-in prompts in user's conversation language (#177)

* fix: present extension opt-in prompts in user's conversation language

* refactor: move language instruction to global requirements-analysis step

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Co-authored-by: Scott Schreckengaust <scottschreckengaust@users.noreply.github.com>

Author: masamaru0513

aidlc-rules/aws-aidlc-rule-details/inception/requirements-analysis.md

@@ -92,7 +92,7 @@ Analyze whatever the user has provided:
 
 ### Step 5.1: Extension Opt-In Prompts
 
-**MANDATORY**: Scan all loaded `*.opt-in.md` files (loaded at workflow start from `extensions/` subdirectories) for an `## Opt-In Prompt` section. For each extension that declares one, include that question in the clarifying questions file created in Step 6.
+**MANDATORY**: Scan all loaded `*.opt-in.md` files (loaded at workflow start from `extensions/` subdirectories) for an `## Opt-In Prompt` section. For each extension that declares one, include that question in the clarifying questions file created in Step 6. Present each opt-in question in the same language as the user's conversation.
 
 After receiving answers:
 1. Record each extension's enablement status in `aidlc-docs/aidlc-state.md` under `## Extension Configuration`: