Change translation keys for ui directory

app/client/ui/DocTour.ts

@@ -20,8 +20,8 @@ export async function startDocTour(docData: DocData, docComm: DocComm, onFinishC
 }
 
 const invalidDocTour: IOnBoardingMsg[] = [{
-  title: t('InvalidDocTourTitle'),
-  body: t('InvalidDocTourBody'),
+  title: t("No valid document tour"),
+  body: t("Cannot construct a document tour from the data in this document. Ensure there is a table named GristDocTour with columns Title, Body, Placement, and Location."),
   selector: 'document',
   showHasModal: true,
 }];