i18n(ja): replace 'TiDB ダッシュボード' with 'TiDB Dashboard'

[yahonda]

What is changed, added or deleted? (Required)

Replace Japanese-translated "TiDB ダッシュボード" and "TiDBダッシュボード" with the English product name "TiDB Dashboard" in PD web UI context (112+ files), keeping Japanese grammar particles intact.

Not changed (Grafana context, remains as katakana ダッシュボード):

• grafana-tidb-dashboard.md, tidb-performance-tuning-config.md, system-variables.md, tidb-upgrade-migration-guide.md, troubleshoot-stale-read.md, troubleshoot-lock-conflicts.md, best-practices/saas-best-practices.md, schema-cache.md

Additional fixes included:

• キービジュアライザー → Key Visualizer (16 occurrences)
• 遅いクエリ/低速クエリ/最もスロークエリ → スロークエリ (100+ occurrences)
• 高価なクエリ → 負荷の高いクエリ (7 occurrences)
• Perl依存関係 → Perl実行環境
• 機械タイプ → マシン種別
• 認証および承認 → 認証および認可
• DashboardUI → Dashboard UI
• 印刷 → 出力 (slow query log context)
• Various missing particles (を, の) added
• English config section headings in ticdc-changefeed-config
• Removed stray annotation numbers not in English original
• TOC, URL path fixes, and other terminology consistency fixes

Decision criteria

• TiDB Dashboard (English, capital D): PD web UI product (固有名詞)
• TiDBダッシュボード (katakana): Grafana TiDB sub-dashboard (一般名称)

Which TiDB version(s) do your changes apply to? (Required)

• master (the latest development version)
• v8.5 (TiDB 8.5 versions)
• v8.4 (TiDB 8.4 versions)
• v8.3 (TiDB 8.3 versions)
• v8.2 (TiDB 8.2 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)
• v5.3 (TiDB 5.3 versions)

What is the related PR or file link(s)?

• This PR is translated from:
• Other reference link(s):

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please assign kissmydb for approval. For more information see the Code Review Process.
Please ensure that each of them provides their approval before proceeding.

The full list of commands accepted by this bot can be found here.

Details

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[gemini-code-assist]

Code Review

This pull request consistently updates the Japanese documentation to use "TiDB Dashboard" instead of "TiDBダッシュボード". The reviewer provided highly constructive and actionable feedback across multiple files to correct minor typos, grammatical errors, formatting issues (such as missing backticks or bold markers), and punctuation in the Japanese text. These suggestions significantly improve the natural flow, readability, and correctness of the Japanese documentation. All review comments are valid and should be kept.

Important

The consumer version of Gemini Code Assist on GitHub is being sunset. Starting June 18, 2026, new organization installations will be blocked, and all code review activity will officially cease on July 17, 2026.
For more details on the timeline and next steps, please review the Help Documentation.