i18n(ja): restore English CSV Configuration field names

[yahonda]

What is changed, added or deleted? (Required)

csv-config-for-import-data.md documents the literal field names shown in TiDB Cloud's CSV Configuration window (Separator, Delimiter, Null Value, Backslash Escape, Skip Header) — all confirmed as genuine UI labels via tidbcloud/dbaas-ui (dbaas/screens/DataImportV2/CSVConfiguration.tsx, each rendered as its own <Typography variant="label-lg"> field label). These were translated into Japanese instead of kept in English, both in the section headings and their inline body references.

Also fixed the same "Edit CSV configuration" button + field-name list in tidb-cloud-import-local-files.md and migrate-sql-shards.md, and a column-header fluency issue in the Backslash Escape sequence table (変換された → 変換後).

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)

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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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