Ability to remove keys as well as move them.

core/move-l10n.groovy

 // Usage: groovy move-l10n.groovy hudson/model/OldClass/old-view jenkins/model/NewClass/new-view 'Some\ Translatable\ Text'
+// (The new view may be given as '-' to simply delete the key.)
 
 def oldview = args[0];
 def newview = args[1];
@@ -14,14 +15,18 @@ for (p in new File(resDir, oldview).parentFile.listFiles()) {
         def lines = p.readLines('ISO-8859-1');
         def matches = lines.findAll({it.startsWith("${key}=")});
         if (!matches.isEmpty()) {
-            def nue = new File(resDir, newview + n.substring(basename.length()));
-            println("moving ${matches.size()} matches from ${n} to ${nue.name}");
             lines.removeAll(matches);
             p.withWriter('ISO-8859-1') {out ->
                 lines.each {line -> out.writeLine(line)}
             }
-            nue.withWriterAppend('ISO-8859-1') {out ->
-                matches.each {line -> out.writeLine(line)}
+            if (newview == '-') {
+                println("deleting ${matches.size()} matches from ${n}");
+            } else {
+                def nue = new File(resDir, newview + n.substring(basename.length()));
+                println("moving ${matches.size()} matches from ${n} to ${nue.name}");
+                nue.withWriterAppend('ISO-8859-1') {out ->
+                        matches.each {line -> out.writeLine(line)}
+                }
             }
         }
     }