RW Blog and localization of the month

Who can tell how to make the correct localization of the month name in the plugin Blog? The localization is shown wrong name of the month (wrong end of the name). And the month name begins with a lowercase letter. Incorrect name of the month shown in the date of the news and in the archives.
How to fix it? Which file is responsible for this?
And it does not depend on the version of the program (RW5, RW6, RW7), all the same.