Google Code-in

I'm going to reduce this task to simply relate to issue 1. I will move issue 2 to a new task.

Your task is to fix the following issue.

Add a ImportLogInterwikiLink hook (PHP)

First, you need to add a hook to MediaWiki's import process to allow sites to alter the wikilink that is output in the log entry and edit summary after a transwiki import. The hook should be called ImportLogInterwikiLink, and the hook function will be passed the interwiki prefix and page title. I'll let you figure out where in the code the call to Hooks::run needs to occur. Don't forget to document the hook in docs/hooks.txt (that file also contains useful info about hooks).