tweak messages & commentary

src/components/DataExportSection.vue

@@ -168,7 +168,7 @@ export default class DataExportSection extends Vue {
           title: "Export Successful",
           text: this.platformCapabilities.hasFileDownload
             ? "See your downloads directory for the backup. It is in the Dexie format."
-            : "Please choose a location to save your backup file.",
+            : "You should have been prompted to save your backup file.",
         },
         -1,
       );