i18n for error messages on server response

assets/javascripts/reporting/controls.js

@@ -129,7 +129,7 @@ Reporting.Controls = {
       Reporting.flash(response.responseText);
       Reporting.Progress.abort();
     } else {
-      Reporting.flash("There was an error getting the results. The administrator has been informed.");
+      Reporting.flash(Reporting._LA["RESPONSE_ERROR"]);
       Reporting.Progress.abort();
     }
   },

assets/javascripts/reporting/lang/reporting-de.js

@@ -1,2 +1,3 @@
 Reporting._LA = {};
 Reporting._LA["REMOVE"] = "Lösche";
+Reporting._LA["RESPONSE_ERROR"] = "Bei der Bearbeitung der Anfrage ist ein Fehler aufgetreten.";

assets/javascripts/reporting/lang/reporting-en.js

@@ -1,2 +1,3 @@
 Reporting._LA = {};
 Reporting._LA["REMOVE"] = "Delete";
+Reporting._LA["RESPONSE_ERROR"] = "There was an error handling the query.";