Fix useAgenticRetrieval missing Japanese translations

[Copilot]

The useAgenticRetrieval feature in the developer settings was displaying text in Chinese and English instead of proper Japanese translations. This affected the main checkbox label, help text, and related configuration options for Japanese users.

Issues Fixed

1. Incorrect Chinese translation: The useAgenticRetrieval label was showing Chinese text "使用主体性检索" instead of Japanese.

2. Missing Japanese help text: The help text for the agentic retrieval checkbox was only available in English.

3. Settings component bug: The useAgenticRetrieval checkbox was referencing the wrong help text key (helpTexts.suggestFollowupQuestions instead of helpTexts.useAgenticRetrieval).

4. Missing translations for related features: The maxSubqueryCount and resultsMergeStrategy controls had no Japanese translations.

Changes Made

• Fixed the Chinese translation to proper Japanese: "エージェント型リトリーバルを使用"
• Added Japanese help text: "Azure AI Search のエージェント型リトリーバルを使用してマルチクエリの計画を行います。常にセマンティック ランカーを使用します。"
• Added missing translations for:
  • maxSubqueryCount: "最大サブクエリ数"
  • resultsMergeStrategy: "結果マージ戦略"
  • Strategy options: "インターリーブ" (interleaved) and "降順" (descending)
• Fixed the Settings.tsx component to use the correct help text reference

Impact

Japanese users will now see all agentic retrieval features properly localized in the developer settings panel instead of Chinese or English text.

Fixes #2693.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• openaipublic.blob.core.windows.net
  • Triggering command: python -m pytest tests/e2e.py::test_chat -v --tb=short -s (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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