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3a7431ce04
Detect when an `app/i18n/<lang>/` directory has no matching `gen.lang.<lang>`
key in the reference language (or vice versa), and refuse to regenerate the
README from that invalid state.
This catches a class of silent corruption where the README translation
table renders literal i18n keys instead of localised language names. The
trigger is most often a case-folded directory on macOS APFS - git tracks
`zh-TW`, the local FS reads back `zh-tw`, the script's `_t('gen.lang.zh-tw')`
lookup misses, and the README ends up with `gen.lang.zh-tw (zh-tw)` instead
of `正體中文 (zh-TW)`. The same check also flags orphan directories (no
display-name key) and orphan keys (no directory).
The new validateLanguageNames() method on I18nData performs a bidirectional
set comparison and returns human-readable issues. cli/check.translation.php
prints them to STDERR and gates --generate-readme on the result, leaving
routine completeness validation behaviour unchanged. Adds four PHPUnit
tests covering: clean state, case mismatch, orphan directory, orphan key.
Co-authored-by: Bjørn A. Andersen <polybjorn@users.noreply.github.com>