0020: i18n with Fluent, en source, pt-BR mandatory (D-020)
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ADR-0020: i18n with Fluent, en source, pt-BR mandatory (D-020)
Section titled “ADR-0020: i18n with Fluent, en source, pt-BR mandatory (D-020)”- Status: Accepted
- Date: 2026-11-01
Context
Section titled “Context”Findings, events and UI copy are assembled from structured data; classic gettext-style concatenation breaks plurals/gender and produces untranslatable strings.
Decision
Section titled “Decision”Fluent (.ftl) in Rust (fluent-bundle) and frontend
(@fluent/bundle). en is the source locale; pt-BR ships in the
same commit as any new string; de, fr, es via Weblate later.
Stable message keys; never concatenate translations.
Consequences
Section titled “Consequences”- Message keys are part of the contract surface (e.g.
title_key,may_affect_keys); changing them is a compatibility event.