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.
I totally agree, we had not been able to find a page in the documentation section, however I have just had a better look through it and found the following page, so have changed the files to point to this URL:

http://our.umbraco.org/documentation/Using-Umbraco/Config-files/webconfig7