This message describes a significant change to the most important button on any wiki:  the "Save page" button will soon be split into two labels:  "Publish page" (for new page creations) and "Publish changes" (for edits to existing pages).  

There are also links in the message for the button labels.  Please check those translations and make sure that they are accurate.  Those translations will be used by default at all MediaWiki installations (not just Wikipedia and its sister projects), so precise, accurate translations are important.  

Experienced editors don't need to read the button's label to know what it does, but user research over the years strongly supports this change for new contributors.  This change will be important to people who teach new editors or who maintain help documentation.