Fix: Optimize dataset page layout and internationalization and default values for multi selection #3221 (#9695)

### What problem does this PR solve?

Fix: Optimize dataset page layout and internationalization and Fix
setting default values for multi selection drop-down boxes #3221

-Adjust the style and layout of each component on the dataset page
-Add and update multilingual translation content

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

web/src/components/originui/select-with-search.tsx

@@ -28,6 +28,7 @@ import {
   PopoverTrigger,
 } from '@/components/ui/popover';
 import { cn } from '@/lib/utils';
+import { t } from 'i18next';
 import { RAGFlowSelectOptionType } from '../ui/select';
 import { Separator } from '../ui/separator';
 
@@ -114,7 +115,9 @@ export const SelectWithSearch = forwardRef<
                 <span className="leading-none truncate">{selectLabel}</span>
               </span>
             ) : (
-              <span className="text-muted-foreground">Select value</span>
+              <span className="text-muted-foreground">
+                {t('common.selectPlaceholder')}
+              </span>
             )}
             <div className="flex items-center justify-between">
               {value && allowClear && (