i18n(ja): unescape HTML entities that render literally in code/text

[yahonda]

What is changed, added or deleted? (Required)

Reported on the ja pd-control page: the heading rendered config [show | set <option> <value> | placement-rules] — the literal entity string < was shown instead of <.

Root cause: the translation pipeline HTML-escaped some characters to numeric/named entities. Inside code spans, tables, and plain text these entities are not decoded, so the reader sees the raw entity. The English source uses none of these entity forms (they are all literal characters there), so this is a Japanese-only artifact.

Fix — restore the literal characters to match the English source:

entity	→	count
&#x3C;	<	112
&#x26;	&	218
&quot;	"	518
&#39;	'	111

Left untouched: < / > / & — the English source also uses these as legitimate escapes in specific contexts, so they are not artifacts. Verified none of the four converted entities sit inside a raw HTML tag/attribute (where conversion could break markup).

Scope: 196 files.

Stacked on #23325 (heading-anchor alignment). Both PRs touch the same pd-control.md heading lines — #23325 fixes the anchors ({#…x3c…} → {#…}), this PR fixes the visible text (< → <); together the headings are fully correct. Review/merge after #23325; until then this PR's diff also shows #23325's changes.

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

• master (the latest development version)
• v8.5 (TiDB 8.5 versions)

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

• Reported page: https://docs.pingcap.com/ja/tidb/stable/pd-control/
• English source (renders correctly): https://docs.pingcap.com/tidb/stable/pd-control/

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[qiancai]

@yahonda, could you please resolve conflicts in this PR? Thanks.

[yahonda]

Rebased.

[qiancai]

@yahonda, sorry to bother you again. It looks like there are new conflicts in this PR. Could you please take a look? Thanks!

[yahonda]

Rebased.

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2026-08-05 12:23:24.817723221 +0000 UTC m=+2617190.853818277: ☑️ agreed by qiancai.