Update to engine_en-GB.xml (it had some words missing that were in ve…

…rsion in xerte svn)

git-svn-id: https://xerteonlinetoolkits.googlecode.com/svn/trunk@506 912cdd6b-5c7d-d5a7-a2ba-d0f0cdb91641

languages/engine_en-GB.xml

@@ -10,6 +10,8 @@
 
   <mediaButton label="Media" description="Media Button. "/>
 
+  <homeButton label="Home" description="Home Button. "/>
+
   <pageHelp name="Page Help" description="Page Help" toClose="Press Space to close help"/>
 
   <glossaryButton label="Glossary" description="Glossary Button. "/>
@@ -75,6 +77,7 @@
   </textSizes>
 
   <volumeControl label="Vol:" description="Volume Control"/>
+  <volumeControlSlider label="" description="Volume Control Slider"/>
 
   <vocab>
 	  <page>Page</page>