Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  24acb7c6045482c42832d44898f6a05ba024a12b
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(minor) change message for statementview 'sources' label

For now, as we don't update the number of sources, we simply don't show the number anymore.
This should be changed again later.

Change-Id: I2912cc392ce6a744542d4aac4d5a3949d464719c