Translate the remaining shell text at display and keep translated values out of logic

shell/plugins/panels/dropbox/Panel.qml

@@ -327,6 +327,7 @@ Panel {
             Text {
               visible: dropbox.files.length === 0
               width: parent.width
+              textFormat: Text.PlainText
               text: I18n.tr("No synced files found.")
               color: root.dim
               font.family: root.fontFamily