Improve error message when querying the External Changelog with an invalid ...

ludovicp

31.07.2010 a33166c79680cdc1154b99df37987140c9bd2e9c

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user-friendly-name=Mem\u00f2ria cau d'acc\u00e9s
user-friendly-plural-name=Mem\u00f2ries cau d'acc\u00e9s