By default, the message is not configured (check "library.zip" in your Mercurial installation folder, you will see the message in text format under hgext\fetch.pyc ).
So, the only way is to update the source code for โfetchโ - try this version , I just changed the message to โFetch mergeโ and it works like an explosion :)
You need to remove library.zip\hgext\fetch.pyc and put fetch.py there (a simple python file) with the content from the link above.
andreister
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