enriclluelles / route_translator / 692

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Do not raise from InvalidLocale error

When a user passes an invalid locale to an unlocalized route (such as
routes outside the `localized` block or an ActiveStorage route itself),
`route_translator` does not check if the locale is included in the
available locales list and Rails will raise an InvalidLocale error.

That could potentially lead to a DOS attack (eg: a third-party exception
Notifier)

This change will prevent route_translator to set the locale if it is not
included in `I18n.available_locales`

Close: #196

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