Skill: Idiomatic Translate (Multi-Language)

Purpose

Translate copy from any source language to any target language with idiomatic fluency, cultural awareness, domain expertise, and consistent voice — language-agnostic pattern optimized for B2B SaaS platforms.

Usage context: Bulk translation of UI copy, help text, error messages, and onboarding content. Automatically detects source language. Replaces mechanical translation with culturally-aware, tonally-consistent output in the target language.

Input

{
  "source_string": "You pay $0.50 per direct link request",
  "source_language": null,                    // null = auto-detect, or explicit: "en", "fr", "de", "es"
  "target_language": "fr",                    // required: "en", "fr", "de", "es", "it", "pt", "nl", etc.
  "context": {
    "domain": "billing",                       // domain expertise context
    "component": "PricingCard",
    "tone": "transparent",                     // transparent, benevolent, precise, casual, formal, technical
    "audience": "expert",                      // expert, prospect, admin, user
    "key": "billing.directLink.perRequest"
  },
  "glossary": {
    "direct link": "lien direct",              // source term : target term (or multi-lang)
    "request": "demande",
    "lead": "prospect",
    "milestone": "jalon"
    // Can also use language-keyed format:
    // "direct link": { "fr": "lien direct", "de": "direkter Link", "es": "enlace directo" }
  },
  "regional_preferences": {
    "currency": "EUR",                         // override default currency ($→€, etc.)
    "date_format": "DD/MM/YYYY",
    "number_format": "de_DE"                   // locale code for number formatting
  },
  "notes": "Avoid formal 'vous' / use informal 'tu', clarify that €0.50 is machine cost not per-lead"
}

Output

{
  "translated_string": "Tu paies 0,50 € par demande traitée",
  "source_language_detected": "en",
  "target_language": "fr",
  "confidence": "high",                         // high, medium, low
  "idiomaticity_score": 4.5,                    // 1-5 scale (5 = native speaker fluency)
  "notes": "Changed 'requête' to 'demande' (more natural in billing context). Used '€' instead of '$' for FR audience. Used informal 'tu' per context. Tone: factual, reassuring.",
  "alternatives": [
    {
      "text": "Tu paies 0,50 € par traitement de demande",
      "note": "More formal variant"
    },
    {
      "text": "Chaque demande te coûte 0,50 €",
      "note": "More casual variant"
    }
  ],
  "cultural_notes": "French audience expects € currency and informal 'tu' in UX context. 'Demande' is more natural than 'requête' in billing."
}

Translation Principles (Universal)

1. Idiomatic > Literal

• ❌ "You pay $0.50 per request" → literal French: "Vous payez 0,50 $ par requête"
• ✅ "You pay $0.50 per request" → idiomatic French: "Vous payez 0,50 € par demande"

(Reasoning: FR audience expects €, not $. "Demande" is more natural than "requête" in billing context.)

For any language pair: Prioritize cultural norms, expected terminology, and natural phrasing over word-for-word mapping.

2. Domain-Aware Glossary Alignment

Glossary can be:

• Flat (single language pair): { "source": "target" }
• Multi-language keyed: { "term": { "en": "...", "fr": "...", "de": "..." } }

Example (project domain):

Skill behavior: Always check glossary first. If term exists in target language, use it. If not, translate idiomatically and flag for glossary update.

3. Universal Tone & Voice Principles

Define voice once, apply across all languages:

4. Context-Aware Adaptation

These apply to ANY language pair:

• Audience: Expert (formal) vs Prospect (friendly) → affects formality level
• Urgency: Error message (concise) vs Help text (detailed) → affects length
• Domain: Billing (precise) vs Onboarding (encouraging) → affects tone
• Length: Button text has tight constraints → abbreviation strategies per language
• Regional preferences: Currency, date format, number separators (e.g., $, €, CHF; DD/MM/YYYY vs MM/DD/YYYY; 1.000,50 vs 1,000.50)

Acceptance Criteria for Translation Quality (Universal)

• AC1: No word-for-word translation (idiomatic fluency required in target language)
• AC2: Glossary consistency — if term exists, use it; if not, flag for addition
• AC3: Tone matches voice definition (transparent, benevolent, precise) across language
• AC4: No untranslatable idioms (if source uses culturally-specific metaphor, adapt to target culture)
• AC5: Character length ≤ 120% of original (avoid unnecessary bloat on buttons/short fields)
• AC6: Regional preferences respected (currency, date format, number formatting)
• AC7: If uncertainty, provide 2-3 alternatives + rationale for each
• AC8: Cultural notes provided (e.g., "German audience expects formal 'Sie' in B2B context")

Output Format

Always return:

1. translated_string — the translated text in target language
2. source_language_detected — auto-detected or confirmed source language (ISO 639-1: en, fr, de, es, etc.)
3. target_language — target language (as requested)
4. confidence — "high", "medium", "low" (based on ambiguity or cultural nuance)
5. idiomaticity_score — 1-5 scale (5 = native speaker fluency, 1 = mechanical)
6. notes — why this translation was chosen (reasoning, cultural decisions, tone adjustments)
7. alternatives — 2-3 alternative translations with rationale for each
8. cultural_notes — any culture-specific context or expectations in target language region

Batch Workflow (Recommended)

Translate in batches (language pair agnostic):

Input: Array of {
  source_string,
  source_language: null or "en"/"fr"/"de"/etc.,
  target_language: "fr" or "de" or "es"/etc.,
  context,
  glossary
}

Process:
1. Auto-detect source language (if not provided)
2. Translate each string to target language
3. Apply domain glossary, tone, regional preferences
4. Provide alternatives + confidence scores

Output: JSON array {
  key,
  source_language_detected,
  target_language,
  translated_string,
  confidence,
  idiomaticity_score,
  notes,
  alternatives,
  cultural_notes
}

Review: Human expert reads all "medium/low" confidence items + "idiomaticity_score" < 4.0
Finalize: Choose final translation or iterate with skill

Velocity: ~50-80 strings per batch per language pair (1-2 hours with review). Scaling: Batch translate to DE, ES, IT simultaneously (parallel skill invocations).

Known Constraints

• Terminology drift: New terms must update glossary immediately (reuse across all language pairs)
  • Example: "qualification_rate" → glossary should map: { "qualification_rate": { "en": "qualification rate", "fr": "taux de qualification", "de": "Qualifizierungsquote" } }
• Context dependency: Same source phrase can translate differently in billing vs error context — always provide context
• Humor/idioms: Culture-specific wordplay is hard to translate idiomatically — flag for manual review or rephrase
• Regional variants: Same language can have regional differences (e.g., European Spanish vs Latin American Spanish, European Portuguese vs Brazilian Portuguese)
• Names/proper nouns: Keep unchanged (your project name, n8n, Zapier, OpenAI, etc.)
• Currency/date/number: Use regional preferences to adapt formatting

Language Coverage & Auto-Detection

Supported languages (confidence > 95%):

• EN (English), FR (Français), DE (Deutsch), ES (Español), IT (Italiano), PT (Português), NL (Nederlands)
• Extensible to others (JA, ZH, etc.) with similar workflow

Auto-detection: Claude's native language detection used if source_language is null. Explicit source language preferred if known.

Notes for Delivery Agent

This skill is discovery-phase only (creates translated content artefacts). The Delivery Agent will:

1. Extract strings from codebase → JSON with source_language, target_language, context
2. Batch translate to one or more target languages (parallel invocations OK)
3. Use skill to generate translations with glossary + tone
4. Review output — all "medium/low" confidence + idiomaticity_score < 4.0
5. Iterate with skill if needed (provide feedback, alternative examples)
6. Integrate into i18n JSON files (structure: locales/{lang}/*.json)
7. Commit to version control
8. Update glossary with any new terms discovered during translation

Post-MVP automation: CI/CD pipeline can auto-translate new strings → PR (human review required for merge). This skill can handle the automation.

Multi-language parallelization: Extract strings once, translate to FR, DE, ES simultaneously (3 parallel skill invocations = faster than sequential).