Fixing pictures

Issue-Ref: 3751
Signed-off-by: Alexandros Tsalidis <tsalidis@fortiss.org>

org.fortiss.af3.rcp.application/html/safety_cases.html

@@ -254,15 +254,15 @@ font-style: italic;
 <li>
 	Right-click anywhere in the editor. Click 'Export Module Diagram ...';
 </li>
-	<p> <img src="./pictures/Exporter1.PNG" /></p>
+	<p> <img src="./pictures/Export1.PNG" /></p>
 	<li>
 		In the next dialogue, choose the preferred format;
 	</li>
-	<p> <img src="./pictures/Exporter2.PNG" /></p>
+	<p> <img src="./pictures/Export2.PNG" /></p>
 	<li>
 		In second dialogue, confirm the preferred format and choose the destination of the exported file;
 	</li>
-	<p> <img src="./pictures/Exporter3.PNG" /></p>
+	<p> <img src="./pictures/Export3.PNG" /></p>
 </ol>
 </p>
 <h3>Explanation of the colors</h3>
@@ -270,7 +270,7 @@ font-style: italic;
 <p>
 The following legend explains the different colors used in the exported document.
 </p>
-<p> <img src="./pictures/Exporter4.PNG" /></p>
+<p> <img src="./pictures/Export4.PNG" /></p>
 
 <h2>Deprecated: Safety Case Patterns</h2>