New l10n_health tool audits Flutter translation files for unused and missing keys

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A developer built l10n_health, a tool that checks Flutter translation files alongside Dart code for problems the analyzer misses. It reports unused keys, missing or untranslated entries across languages, mismatched placeholders, hardcoded text that bypasses localization, and hidden invisible Unicode characters. The tool works with gen_l10n and flutter_intl and can be installed globally or as a dev dependency. It also includes a careful prune command that removes unused keys as a text edit after validating the JSON, and can produce HTML, GitLab, and GitHub reports for CI.

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