Update Custom Exception Handler section of Internationalization guide

The previous example with just_raise_that_exception method
stopped working because MissingTranslation is not an instance of
Exception class any more, but has a +to_exception+ method.

Also the cleaner way is to re-raise only the desired exception, passing
 everything else to the default ExceptionHandler.

 Additionally this re-raising conflicts with Pluralization backend thus
 we have to add a check that certain missing translation keys should
 be ignored allowing the backend to fall back to the default
 pluralization rule.

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