feat: add file icon to table of FileManager #345 (#543)

### What problem does this PR solve?

feat: add file icon to table of FileManager #345
fix: modify datasetDescription

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

web/src/locales/en.ts

@@ -70,7 +70,7 @@ export default {
       namePlaceholder: 'Please input name!',
       doc: 'Docs',
       datasetDescription:
-        "Hey, don't forget to adjust the chunk after adding the dataset! 😉",
+        '😉 Questions and answers can only be answered after the parsing is successful.',
       addFile: 'Add file',
       searchFiles: 'Search your files',
       localFiles: 'Local files',