Add initial Portuguese (pt) translation agent skill (#62001)

.github/skills/airflow-translations/SKILL.md

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+# Global Airflow Translation Agent Skill
+
+This file will contain shared terminology rules for all locales.
+
+For Portuguese (pt) see: locales/pt.md
+
+(Global content coming soon from #61985 / #62059)

.github/skills/airflow-translations/locales/pt.md

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+# Portuguese (pt) Translation Agent Skill
+
+**Locale code:** `pt`
+
+This file contains locale-specific guidelines so AI translation agents produce new Portuguese strings that stay 100% consistent with the existing translations in:
+
+`airflow-core/src/airflow/ui/public/i18n/locales/pt/*.json`
+
+## 1. Core Airflow Terminology (global – sync with SKILL.md when available)
+
+- Keep these terms **in English unchanged** (case-sensitive):
+  - Dag / Dags
+  - Asset / Assets / Asset Events
+  - Backfill / Backfills
+  - XCom / XComs
+  - TaskInstance, DagRun, Triggerer, Executor, Pool, Provider, etc.
+- Never use "DAG" – always "Dag"
+- Product names: "Airflow" stays "Airflow"
+
+## 2. Portuguese-Specific Guidelines
+
+- Use natural, fluent Portuguese.
+- Respect gender and number agreement (feminine/masculine, singular/plural).
+- Follow existing i18next plural keys: `_one`, `_many`, `_other`, `_zero`
+- Capitalization: Sentence case for descriptions, title-like for headers/buttons (match existing files).
+- Spelling/vocab: Follow patterns in current JSON (e.g. "Excluir", "Adicionar", "Executando", "Enfileirado", "Secção", "detetadas", "Sobreescreve").
+
+## 3. Examples from Existing Translations
+
+**Always keep in English:**
+- "Dag" → "Dag"
+- "Asset" → "Asset"
+- "Backfill" → "Backfill"
+- "XCom" → "XCom"
+
+**Common translated patterns:**
+- "task_one"       → "Tarefa"
+- "task_many"      → "Tarefas"
+- "dagRun_one"     → "Execução do Dag"
+- "dagRun_many"    → "Execuções do Dag"
+- "allRuns"        → "Todas as Execuções"
+- "running"        → "Executando"
+- "failed"         → "Falha"
+- "success"        → "Sucesso"
+- "queued"         → "Enfileirado"
+- "Add"            → "Adicionar"
+- "Delete"         → "Excluir"
+- "Edit"           → "Editar"
+- "Save"           → "Salvar"
+- "Test"           → "Testar"
+- "Import"         → "Importar"
+- "Config"         → "Configuração do Airflow"
+
+## 4. Agent Instructions (DO / DON'T)
+
+**DO:**
+- Match tone, style, gender, casing from existing `pt/*.json` files
+- Use natural Portuguese readable by Brazilian & Portuguese users
+- Preserve all placeholders: `{{count}}`, `{{dagName}}`, etc.
+- For plurals: provide all needed suffixes if source has them
+
+**DON'T:**
+- Translate core terms listed in section 1
+- Invent new vocabulary when equivalent already exists
+- Translate hotkeys, code references, or file paths
+