That was true of most of them through 2010 (though the 2008/2010 Web Developer Express supported, IIRC, at least C# and VB.NET as backend languages.), but not the 2012/2013 versions.
The VS2012/2013 Express Editions are not language specific, but project type specific -- the 2012 editions were "for Web", "for Windows 8" (i.e., Metro/Modern UI), "for Windows Desktop", and "for Windows Phone". 2013 merged "for Windows 8" and "for Windows Phone" into "for Windows".
That was true of most of them through 2010 (though the 2008/2010 Web Developer Express supported, IIRC, at least C# and VB.NET as backend languages.), but not the 2012/2013 versions.
The VS2012/2013 Express Editions are not language specific, but project type specific -- the 2012 editions were "for Web", "for Windows 8" (i.e., Metro/Modern UI), "for Windows Desktop", and "for Windows Phone". 2013 merged "for Windows 8" and "for Windows Phone" into "for Windows".