Wikimedia Foundation projects, its status has changed. It is now part of the regular software.
As the software is moved to different directories it is a good moment to end the statistics that have been running for quite some time. The "most often used messages" will change in a few weeks at translatewiki.net so this is a great moment to prepare for the things to come.
As the relevance of the usability software has increased, it is even more relevant to make sure that its messages are localised. Most of them have been moved elsewhere so it is now more of a puzzle to get them all done.
Actually best is to localise them all anyway.. :)