Fix empty translation.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit 2c64136fbe)

kplato/kptprojectdialog.cc

@@ -100,15 +100,15 @@ void ProjectDialog::slotSchedulingChanged(int activated) {
             break;
         case 2: // Start not earlier then
             label = label.arg(i18n("Start not Earlier then"));
-            label = label.arg(i18n(""));
+            label = label.arg("");
             break;
         case 3: // Finish not later then
             label = label.arg(i18n("Finish not Later then"));
-            label = label.arg(i18n(""));
+            label = label.arg("");
             break;
         case 4: // Must start on
             label = label.arg(i18n("Must Start on"));
-            label = label.arg(i18n(""));
+            label = label.arg("");
             break;
         default: // error ...
             dia->lSchedulingExplain->setText("");