We noticed first one and fixed, next 2 fixed now based on you report. These changes will be reflected in next release.
Also changing ‘messages.php’ will not fix them. You have to change them everywhere inside code. We use Netbeans PHP editor (http://netbeans.org) for writing project. It has easy search and replace feature in ‘Edit’ -> ‘Replace in projects’ menu. You can use it to replace typos on all files.
Thank you for reporting.