Updated the language files to fix issue #U4-3979

Also corrected invalid URL's across all the language files as they pointed to pages on Umbraco.com/org that 404'ed.
Well, originally these files were all created by different people, so you would expect the creator name to be different between the different language files. As I have now also worked on them all, I think it would be fair to reset them all to being:

    <name>The Umbraco community</name>
    <link>http://our.umbraco.org</link>

As mentioned in my previous comment.