feat(i18n): explicit fallback locale chain (closes #425)#508
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Adds `Translator::with_fallback_chain(&["pt", "es"])` so apps can specify an ordered fallback path between the requested locale (and its base language) and the default-locale terminus. Mirrors Django's `LANGUAGE_CODE` + `LANGUAGES` fallback semantics. Lookup order: 1. exact locale (e.g. fr-CA) 2. base language (fr) 3. explicit fallback_chain entries in declaration order 4. default_locale 5. the key itself Duplicate entries and entries equal to default_locale are silently dropped on insert. `Translator::fallback_chain()` exposes the configured chain for diagnostics. Three new inline tests cover order-walking, default-locale terminus, and dedup behavior.
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May 23, 2026
## Summary Rolls 11 PRs from \`develop\` into \`main\`. ## Features (5) - **#507** \`i18n::middleware::LocaleMiddleware\` — tower layer (cookie + Accept-Language) + documented \`Router::nest(\"/<lang>\", ...)\` pattern for URL-prefix locales. Closes #406, #424. - **#508** \`Translator::with_fallback_chain(&[...])\` — explicit fallback locale chain. Closes #425. - **#509** \`notifications::slack::webhook_callback(url)\` — Slack incoming-webhook provider for the \`broadcast\` channel. Closes #418. Also bumps \`free-disk-space\` reclaim (\`large-packages: true\`). - **#510** Notifications fix — gate the \`database\` channel behind the \`postgres\` feature so non-PG builds compile. ## Refactor: executor reorg (#116, 7 PRs) Pulled \`crates/rustango/src/sql/executor.rs\` (4830 LOC) apart into \`crates/rustango/src/sql/executor/\` with 9 sibling files. - **#511** Mount as dir. - **#512** \`page.rs\` + \`iter.rs\` + \`get_or_create.rs\`. - **#513** \`values.rs\` (Django \`.values()\` / \`.values_list()\`). - **#514** \`atomic.rs\` (\`transaction.atomic\` + \`on_commit\`) + \`tx.rs\` (\`PoolTx\`). - **#515** \`explain.rs\` (tri-dialect \`EXPLAIN\`). - **#516** \`prefetch.rs\` (tri-dialect \`_pool\` prefetch). - **#517** \`row_to_json.rs\` (per-dialect dynamic row → JSON). mod.rs is now at 2923 LOC (-1907, **-39%**). Zero public-API change throughout — every symbol still reachable from \`use rustango::sql::*\`. ## Test plan Every constituent PR landed with sqlite_litmus + sqlite_live + mysql_live + postgres_test all green. The merge itself is a no-conflict fast-forward — no new code lands beyond what's already merged into develop. Re-running CI on the merged main confirms the integration shape.
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Summary
Translator::with_fallback_chain(&[\"pt\", \"es\"])so apps can declare an ordered fallback path between the requested locale (and its base language) and the default-locale terminus. Mirrors Django'sLANGUAGE_CODE+LANGUAGESfallback semantics.Translator::fallback_chain()accessor for diagnostics.Closes
#425
Test plan