Blog Translate, SEO-Optimized Blog Translation

Translates an existing blog post into one or more target languages. Unlike generic translation, this skill produces SEO-optimized, publication-ready content with localized keywords, meta tags, and culturally correct formatting.

Adapted from claude-blog-multilingual by Chris Mueller (Pro Hub Challenge, March 2026). Original: https://github.com/Chriss54/multilingual-int

Key References

Load on demand:

• references/translation-rules.md, format preservation, number/date/currency formats per locale, quote handling, quality criteria.
• references/cultural-adaptation.md, cultural profiles per locale (DACH, Francophone, Hispanic, Japanese, custom). This file is shared with blog-localize (do not duplicate).

Workflow

Phase 1: Input Parsing

1. Read the source file (markdown, MDX, or HTML) only after resolving it against the project root/current working directory. Reject symlinked paths, traversal outside the root, files over 10 MB, and binary files.
2. Auto-detect source language. Order of preference:
   • Frontmatter lang field.
   • HTML lang attribute.
   • Content analysis (script, common stop words).
3. Parse target languages from --to as comma-separated Google-compatible hreflang tags (de, fr, es-MX, ja, pt-BR, zh-Hant). If --to is missing, ask the user once: "Which languages should I translate to? Provide hreflang tags such as de, fr, es-MX, ja, pt-BR."
4. Normalize every code with the shared multilingual locale rules used by blog-multilingual, blog-localize, and blog-locale-audit: ISO 639-1 language in lowercase, optional ISO 15924 script in title case, optional ISO 3166-1 Alpha-2 region in uppercase. Reject invalid codes with a suggestion (jp becomes "Did you mean ja for Japanese?"). Require a region or explicit neutral mode for ambiguous language-only targets such as es, pt, and zh. If a target equals the normalized source language, skip it with a notice.

Phase 2: Content Analysis

Extract the translatable surface:

• Frontmatter: title, description, tags, author (only when translatable, e.g. role labels, not personal names).
• All headings (H1, H2, H3).
• Body paragraphs.
• Image alt text and <figcaption> content.
• Chart <text> and <tspan> content; preserve every SVG attribute (x, y, font-size, fill, transform).
• FAQ questions and answers.
• Evidence-backed explanation text.
• Key Takeaways or summary box.
• CTA text.
• Internal-link zone anchor text.

Preserve unchanged:

• Markdown and HTML structure, tags, attributes.
• Image URLs, link URLs, frontmatter keys.
• Executable code fences and inline code. Translate comments only outside executable code, or when the user explicitly asks for localized tutorial comments.
• Internal-link zone markers ([INTERNAL-LINK: ...]).
• Source organization names in citations (Gartner, McKinsey, etc.).
• Person names.
• Schema JSON-LD blocks (translate user-facing content strings only; never translate Person, Organization, or Brand names, URLs, IDs, @id, or sameAs).

Identify the primary and secondary keywords for Phase 3.

Phase 3: Keyword Localization

For each target language:

1. Decide whether the source keyword is the established term in the target market. If yes (e.g., "Content Marketing" stays in German), keep it.
2. If a local equivalent has real search behavior, swap to it.
3. Apply the same logic to secondary keywords.
4. Record the mapping. The translator agent uses it to update title, meta description, and H2 headings consistently.

Phase 4: Translation

Spawn the blog-translator agent (via Task) for each target language with:

• The source content.
• The keyword localization map from Phase 3.
• The target language code.
• Pointer to references/translation-rules.md.
• Instruction to limit this phase to language, register, natural topical coverage, and formatting. Reserve brand, legal, statistic, and cultural substitutions for blog-localize.

Run agents in parallel when translating into multiple languages.

The agent returns the fully translated post in the same format as the input.

Phase 5: Post-Processing

For each translated version:

1. Add or update locale frontmatter:

   lang: "de"
   translatedFrom: "en"
   translatedDate: "YYYY-MM-DD"
   slug: "wie-man-ki-slop-vermeidet"
   

2. Verify structural integrity:
   • Same number of H2 and H3 sections as the original.
   • All images present with translated alt text.
   • All SVG charts present with translated text labels (length-adjusted: DE +30%, FR +15%, JA -20%, others see references/translation-rules.md).
   • FAQ count matches.
   • Evidence-backed explanations from the source remain intact where present.
3. Save translated files:

   translations/
     {lang}/{localized-slug}.{ext}
   

   When invoked from blog-multilingual, save into multilingual/{lang}/{localized-slug}.{ext} instead. Before writing, slugify {localized-slug} to lowercase ASCII with only a-z, 0-9, and hyphens, rejecting empty or reserved names. Create the language directory from the normalized hreflang code only. Resolve the final path and require it to stay inside the intended output root; reject symlinked output paths.

Phase 6: Translation-Quality Guardrails

Scan the output for machine-translation artifacts before reporting done:

• Literal idioms (English idioms transliterated, not adapted).
• Unnatural word order (SOV translated as SVO into a non-SVO language, or the reverse).
• Mixed-language sentences (other than established loanwords).
• Number, date, or currency strings still in source format.
• Frontmatter strings still in the source language.

Flag every issue inline (file path, line number, fix suggestion). The translator agent should re-pass any flagged passage before delivery.

Phase 7: Delivery

## Translation complete: [Original title]

### Source
- Language: [source]
- File: [source path]

### Translations
| Language | File | Keywords adapted | Status |
|----------|------|------------------|--------|
| de | translations/de/{slug}.md | [N] | ok |
| fr | translations/fr/{slug}.md | [N] | ok |

### Quality checks
- Structural integrity: pass / fail per language
- Meta tags localized: pass / fail per language
- Numbers, dates, currencies formatted per locale: pass / fail
- Keywords localized: [N] keywords adapted
- Machine-translation artifacts flagged: [N] (see notes above)

### Next steps
- Run `/blog localize <file> --locale <code>` for cultural deep-adaptation.
- Run `/blog locale-audit translations/` to verify completeness.
- Use `/blog multilingual` to combine write, translate, localize, hreflang
  in one command.

Error Handling

Scenario	Action
Unsupported language code	Suggest the correct Google-compatible hreflang code
Source equals a target	Skip with "Source is already in [lang]"
File not found	Report error with suggested path
Translator agent timeout	Retry once, then report partial results
Binary or non-text file	Report error, suggest correct file

Cross-References

• Next step (cultural depth): /blog localize <file> --locale <code>
• QA sweep across all language versions: /blog locale-audit <directory>
• One-command pipeline: /blog multilingual <topic> --languages <codes>