Bug 10474: Translate some English strings in German sample notices

This translates 2 strings missed doing the initial translation in
ISSUESLIP.

To test:
- Run the web installer in German.
Altnernatively:
- Truncate your letters table and run the SQL against the database.

Check that the notices were added correctly, especially ISSUESLIP.

Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>

installer/data/mysql/de-DE/mandatory/sample_notices.sql

@@ -45,12 +45,12 @@ Fällig am: <<issues.date_due>><br />
 
 <hr>
 
-<h4 style="text-align: center; font-style:italic;">News</h4>
+<h4 style="text-align: center; font-style:italic;">Neuigkeiten</h4>
 <news>
 <div class="newsitem">
 <h5 style="margin-bottom: 1px; margin-top: 1px"><b><<opac_news.title>></b></h5>
 <p style="margin-bottom: 1px; margin-top: 1px"><<opac_news.new>></p>
-<p class="newsfooter" style="font-size: 8pt; font-style:italic; margin-bottom: 1px; margin-top: 1px">Posted on <<opac_news.timestamp>></p>
+<p class="newsfooter" style="font-size: 8pt; font-style:italic; margin-bottom: 1px; margin-top: 1px">Veröffentlicht am <<opac_news.timestamp>></p>
 <hr />
 </div>
 </news>', 1),