fixes for ultra-strict html5 validation

content/news/event-clt2005.xml

@@ -41,6 +41,7 @@
        </li>
    </ul>
    <dl>
+     <dt>Impressions</dt>
        <dd>
            <image title="Impressions">../images/clt2005/03e3dd91a1.jpg</image>
            <image title="Impressions">../images/clt2005/10dfb4e12b.jpg</image>

content/news/event-inet-night2.xml

@@ -48,6 +48,7 @@
     </ul>
     <p title="Visuell"/>
     <dl>
+      <dt>Impressions</dt>
         <dd>
             <image title="Impressions">../images/inight2/039004608b.jpg</image>
             <image title="Impressions">../images/inight2/040ae5cac2.jpg</image>

xsl/calendar.xsl

@@ -9,7 +9,7 @@
 <xsl:include href="ddate.xsl" />
 
 <xsl:template match="/page/calendar-summary">
-  <table border="0" class="calendar">
+  <table class="calendar">
     <tr>
       <th>Montag</th>
       <th>Dienstag</th>

xsl/datenspuren/html5.xsl

@@ -65,7 +65,7 @@
         <xsl:value-of select="x:h1"/>
       </h2>
 
-      <table cellpadding="4" cellspacing="6" class="schedule">
+      <table class="schedule">
         <tr>
           <xsl:for-each select="x:table/x:thead/x:tr/x:th">
             <th>