Offline links epub/pdf

Doc/preface.xml

@@ -78,10 +78,10 @@
       help</productname> zip archive</glossterm>
 
       <glossdef>
-        <para><link
-        xlink:href="https://freedocs.mi.hdm-stuttgart.de/webhelp/lectures.zip">Zipped
-        archive</link> of all previously mentioned resources for offline
-        usage. Does contain the following offline versions:</para>
+        <para>Self contained <link
+        xlink:href="https://freedocs.mi.hdm-stuttgart.de/webhelp/lectures.zip">zip
+        archive</link> of previously mentioned resources for offline usage.
+        Does contain the following offline links:</para>
 
         <itemizedlist>
           <listitem>