Fix: xls not supported (#329)

web/app/components/datasets/create/file-uploader/index.tsx

   '.md',
   '.markdown',
   '.txt',
-  '.xls',
+  // '.xls',
   '.xlsx',
   '.csv',
 ]

web/i18n/lang/dataset-creation.en.ts

       title: 'Upload text file',
       button: 'Drag and drop file, or',
       browse: 'Browse',
-      tip: 'Supports txt, html, markdown, xlsx, xls, and pdf.',
+      tip: 'Supports txt, html, markdown, xlsx, and pdf.',
       validation: {
         typeError: 'File type not supported',
         size: 'File too large. Maximum is 15MB',

web/i18n/lang/dataset-creation.zh.ts

       title: '上传文本文件',
       button: '拖拽文件至此，或者',
       browse: '选择文件',
-      tip: '已支持 TXT, HTML, Markdown, PDF, XLSX, XLS',
+      tip: '已支持 TXT, HTML, Markdown, PDF, XLSX',
       validation: {
         typeError: '文件类型不支持',
         size: '文件太大了，不能超过 15MB',