i18n(ja): fix translation defects in the v2.0.6 to v2.1.19 and pre-GA release notes

[yahonda]

What is changed, added or deleted? (Required)

Fixes translation defects in the Japanese release notes for v2.0.6 to v2.1.19, pre-GA, and RC 1 to RC 4 (35 files). This is the second half of round 9, the last round of the releases/ review. I checked each item against its EN bullet (release-8.5) and against resources/terms-en-ja.md.

Meaning and number fixes

• 2.1.14 L47: "the number of LevelDB L0 files is 0" became "is large".
• 2.1.16 L29: "larger than 65535" lost the number.
• 2.1.17 L43: JSON_UNQUOTE "over-unquotes"; JA said "do not enclose in quotes".
• 2.1.1 L34: "cannot stop caused by deadlock" became "dead RaftCluster".
• 2.0.9 L23: values and NULL were swapped.
• 2.1.8 L32: "the 2019.01.01 time format" became 「回限り」 ("one-time").
• 2.1-rc.1 L78: "more SYSTEM variables" became "SYSTEM or above".
• Scrambled sentences where an identifier had been moved to the end:
  • 2.1-beta: L17 (function pushdown list) and L48.
  • 2.0.6: L32.
  • 2.0.7: L23 and L36.
  • 2.1-rc.1: L80 and L84.
  • 2.1-rc.2: L81 and L113.
  • 2.1-rc.5: L39.
  • 2.1.11: L37.
  • 2.1.14: L20.
  • 2.1.15: L22.
  • 2.1.16: L35.
  • 2.1.17: L25.
  • rc.3: L26.
• Changelog items that read as instructions to the reader: 2.1-ga (RocksDB upgrade), 2.1.5, rc.1.

Wrong-domain words

• 表現 → 式 and 特徴 → 新機能 in section labels.
• pd-回復 → pd-recover.
• セグメント障害 → セグメンテーション違反.
• コードの乱雑 → 文字化け.
• 出口 → 終了.
• 条項 → 句.
• 加算 → 追加.
• 未使用 → 未消費.
• 一致 → 遭遇.
• 選択と投影 → Selection & Projection.
• ジェプセン → Jepsen.
• 領域 → リージョン.
• リージョン統合/結合 → リージョンマージ.

Particles

• Restores particles dropped after backticks (about 150 sites); removes stray 目/つ artifacts.

Not changed:

• Existing 「パニック」 and the established lowercase 「ラーナー」.
• 圧縮 for compaction, which is a separate sweep.
• The order and spacing of issue links.

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

Tips for choosing the affected version(s):

By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.

For details, see tips for choosing the affected versions.

• i18n-ja-release-8.5 (TiDB Japanese documentation for TiDB 8.5 versions)

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

• This PR is translated from:
• Other reference link(s): i18n(ja): fix translation defects in the v8.5.x release notes #24143, i18n(ja): fix translation defects in the v8.1.0, v8.1.2, and v8.2.0 release notes #24148, i18n(ja): fix translation defects in the v8.0.0, v8.3.0, and v8.4.0 release notes #24152, i18n(ja): fix translation defects in the v7.0.0 to v7.4.0 release notes #24153, i18n(ja): fix translation defects in the v7.5.x and v7.6.0 release notes #24154, i18n(ja): fix translation defects in the v6.0.0 to v6.4.0 release notes #24157, i18n(ja): fix translation defects in the v6.5.x and v6.6.0 release notes #24158, i18n(ja): fix translation defects in the v5.0.x to v5.2.x release notes #24164, i18n(ja): fix translation defects in the v5.3.x and v5.4.x release notes and the release index #24165, i18n(ja): fix translation defects in the v4.0.0-beta to v4.0.9 release notes #24171, i18n(ja): fix translation defects in the v4.0.10 to v4.0.16 release notes #24172, i18n(ja): fix translation defects in the v3.0-beta to v3.0.14 release notes #24178, i18n(ja): fix translation defects in the v3.0.15 to v3.1.2 release notes #24179

AI agent involvement

• The changes in this PR were primarily made by an AI agent on behalf of the PR author.

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

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📥 Commits

Reviewing files that changed from the base of the PR and between a4dfec7 and cab82b9.

📒 Files selected for processing (35)

• releases/release-2.0.6.md
• releases/release-2.0.7.md
• releases/release-2.0.8.md
• releases/release-2.0.9.md
• releases/release-2.1-beta.md
• releases/release-2.1-ga.md
• releases/release-2.1-rc.1.md
• releases/release-2.1-rc.2.md
• releases/release-2.1-rc.3.md
• releases/release-2.1-rc.4.md
• releases/release-2.1-rc.5.md
• releases/release-2.1.1.md
• releases/release-2.1.10.md
• releases/release-2.1.11.md
• releases/release-2.1.12.md
• releases/release-2.1.13.md
• releases/release-2.1.14.md
• releases/release-2.1.15.md
• releases/release-2.1.16.md
• releases/release-2.1.17.md
• releases/release-2.1.18.md
• releases/release-2.1.19.md
• releases/release-2.1.2.md
• releases/release-2.1.3.md
• releases/release-2.1.4.md
• releases/release-2.1.5.md
• releases/release-2.1.6.md
• releases/release-2.1.7.md
• releases/release-2.1.8.md
• releases/release-2.1.9.md
• releases/release-pre-ga.md
• releases/release-rc.1.md
• releases/release-rc.2.md
• releases/release-rc.3.md
• releases/release-rc.4.md

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Timeline:

• 2026-10-08 07:53:29.946460088 +0000 UTC m=+285619.693690927: ☑️ agreed by qiancai.