[BUGFIX] NEWS.txt refers to invalid language code

The language code of Austria is not de_AU, but de_AT.

Change-Id: I751df88b1bf6555910360142ed95dc5bc21781a8
Resolves: #31256
Releases: 4.6
Reviewed-on: http://review.typo3.org/6279
Reviewed-by: Philipp Gampe
Tested-by: Philipp Gampe
Reviewed-by: Xavier Perseguers
Tested-by: Xavier Perseguers

NEWS.txt

@@ -90,10 +90,10 @@ default (English) localization files. This behaviour may be changed by
 specifying arbitrary dependencies:
 
  $TYPO3_CONF_VARS['SYS']['localization']['locales']['dependencies'] = array(
-     'de_CH' => array('de_AU', 'de'),
+     'de_CH' => array('de_AT', 'de'),
  );
 
-Swiss German (de_CH) will fall back to Austrian German (de_AU), then German
+Swiss German (de_CH) will fall back to Austrian German (de_AT), then German
 (de) and finally English (always used as last option).
 
 * Upgrade notes for JavaScript within user extensions
@@ -458,4 +458,4 @@ The same options apply for includeCSS.
 
 Please note that compression and concatenation apply for external resources as
 well. If activated, external resources will be dynamically retrieved, processed,
-and served locally.
\ No newline at end of file
+and served locally.