Make default job name translateable

Contributes to issue CURA-5367.

resources/qml/JobSpecs.qml

@@ -81,7 +81,7 @@ Item {
                 text: PrintInformation.jobName
                 horizontalAlignment: TextInput.AlignRight
                 onEditingFinished: {
-                    var new_name = text == "" ? "unnamed" : text;
+                    var new_name = text == "" ? catalog.i18nc("@text Print job name", "unnamed") : text;
                     PrintInformation.setJobName(new_name, true);
                     printJobTextfield.focus = false;
                 }