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Pleas remove the double colon in the edit summary:

Example:
(GWToolset:: Creating mediafile for...)
to
(GWToolset: Creating mediafile for...)

if i remember correctly, there’s a translation key on commons that controls the 
spelling of the edit summary. i don’t remember how to access it, but the key 
is gwtoolset-create-prefix

https://commons.wikimedia.org/w/index.php?title=MediaWiki%3AGwtoolset-create-prefix&diff=123141372&oldid=112292713 should fix it.