Removed call to deprecated QRcode_clearCache().

QRcode_clearCache has been deprecated in libqrencode 4.0.  In previous versions,
it was only necessary to help debug memory leaks.  So it should be harmless
to remove this call.

backends/barcode/QrEncode.cpp

@@ -80,7 +80,6 @@ namespace glabels
 
 
 				QRcode_free( qrcode );
-				QRcode_clearCache();
 
 				return true;
 			}

translations/templates_C.ts

@@ -427,5 +427,9 @@
         <source>Postage stamp labels</source>
         <translation type="unfinished"></translation>
     </message>
+    <message>
+        <source>CD/DVD spine labels</source>
+        <translation type="unfinished"></translation>
+    </message>
 </context>
 </TS>