Fix: UI Placeholder and Hint Optimization (#13416)

### What problem does this PR solve?

Fix: UI Placeholder and Hint Optimization

### Type of change

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

web/src/components/cross-language-form-field.tsx

@@ -60,7 +60,7 @@ export const CrossLanguageFormField = ({
           <FormControl>
             <MultiSelect
               options={crossLanguageOptions}
-              placeholder={t('fileManager.pleaseSelect')}
+              placeholder={t('chat.crossLanguagePlaceholder')}
               maxCount={100}
               {...field}
               onValueChange={field.onChange}

web/src/components/knowledge-base-item.tsx

@@ -127,7 +127,7 @@ export function KnowledgeBaseFormField({
               onValueChange={(value) => {
                 handleDatasetSelectChange(value, field.onChange);
               }}
-              placeholder={t('chat.knowledgeBasesMessage')}
+              placeholder={t('chat.knowledgeBasesPlaceholder')}
               variant="inverted"
               maxCount={100}
               defaultValue={field.value}

web/src/components/parse-configuration/raptor-form-fields.tsx

@@ -227,7 +227,10 @@ const RaptorFormFields = ({
             render={({ field }) => (
               <FormItem className=" items-center space-y-0 ">
                 <div className="flex items-center">
-                  <FormLabel className="text-sm  whitespace-wrap w-1/4">
+                  <FormLabel
+                    className="text-sm  whitespace-wrap w-1/4"
+                    tooltip={t('randomSeedTip')}
+                  >
                     {t('randomSeed')}
                   </FormLabel>
                   <div className="w-3/4">

web/src/components/rerank.tsx

@@ -39,6 +39,7 @@ function RerankFormField() {
           <FormControl>
             <SelectWithSearch
               allowClear
+              placeholder={t('rerankPlaceholder')}
               {...field}
               options={options}
             ></SelectWithSearch>