Removed old language method

jplag.frontend-utils/src/main/java/de/jplag/Language.java

@@ -48,14 +48,6 @@ public interface Language {
         return true;
     }
 
-    /**
-     * Determines whether a fixed-width font should be used to display that language.
-     */
-    // TODO DF: This method is not used!
-    default boolean isPreformatted() {
-        return true;
-    }
-
     /**
      * Indicates whether the input files (code) should be used as representation in the report, or different files that form
      * a view on the input files.