Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  a7547a058ca5ac35b37463de6a1e5e6226dece80

add missing wikibase-comment-add message

this message should be rarely seen but can be seen
when an item get created and then linked to existing
page in client, in such time frame that the changes
do not get batched.

Change-Id: I18275e3be723ae8b021637500de418c3b345c8cd