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Symfony processes all the application translation files as part of the process that compiles the application code before executing it. If there's an error in any translation file, you'll see an error message explaining the problem.
If you prefer, you can also validate the contents of any YAML translation file
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# lint a single file $ ./app/console lint:yaml app/Resources/translations/messages.en.yml # lint a whole directory $ ./app/console lint:yaml app/Resources/translations # lint a specific bundle $ ./app/console lint:yaml @AppBundle
The linter results can be exported to JSON using the
# lint a single file $ ./app/console lint:yaml app/Resources/translations --format=json