Add label-string to translations

plugins/3MFReader/WorkspaceDialog.qml

@@ -487,7 +487,7 @@ UM.Dialog
                 UM.Label
                 {
                     id: warningText
-                    text: "The material used in this project is currently not installed in Cura.<br/>Install the material profile and reopen the project."
+                    text: catalog.i18nc("@label", "The material used in this project is currently not installed in Cura.<br/>Install the material profile and reopen the project.")
                 }
             }