This script (source) adds c:CommonsHelper to the toolbar on the left to make file moves to Wikimedia Commons easier. The file name is automatically prefilled upon clicking the link.
This script can be imported to skin.js or common.js by adding:
{{subst:Iusc|User:Epicgenius/commonshelperlink.js}}
This script can be adapted for use on other languages' wikis as well. Just create a javascript page in your language with the code
mw.loader.load('//commons.wikimedia.org/w/index.php?title=User:Epicgenius/commonshelperlink.js&action=raw&ctype=text/javascript');