Updated mediawiki/extensions
Project: mediawiki/extensions/CopyToClipboard  51769419287f9429916df3400cd5823944090b77
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Consistency tweaks in preparation for extension to translatewiki.net

* Standardize description message key and text
* Add message documentation

Change-Id: I1dd02d104df20d79e74d48ca98cf27cfa6b30089