Added .sc filename extension for Scala source code, as it is occasionally used

data/freedesktop.org.xml.in

@@ -6504,6 +6504,7 @@ command to generate the output files.
     <comment>Scala source code</comment>
     <sub-class-of type="text/plain"/>
     <glob pattern="*.scala"/>
+    <glob pattern="*.sc"/>
   </mime-type>
   <mime-type type="text/x-scheme">
     <comment>Scheme source code</comment>