Feat: Translate the system prompt of the generate operator #3993 (#4283)

### What problem does this PR solve?

 Feat: Translate the system prompt of the generate operator #3993

### Type of change


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

web/src/locales/en.ts

@@ -1096,6 +1096,7 @@ This delimiter is used to split the input text into several text pieces echo of
       addVariable: 'Add variable',
       variableSettings: 'Variable settings',
       globalVariables: 'Global variables',
+      systemPrompt: 'System prompt',
     },
     footer: {
       profile: 'All rights reserved @ React',

web/src/locales/zh-traditional.ts

@@ -1032,6 +1032,7 @@ export default {
       },
       addVariable: '新增變數',
       variableSettings: '變數設定',
+      systemPrompt: '系統提示詞',
     },
     footer: {
       profile: '“保留所有權利 @ react”',

web/src/locales/zh.ts

@@ -1076,6 +1076,7 @@ export default {
       },
       addVariable: '新增变量',
       variableSettings: '变量设置',
+      systemPrompt: '系统提示词',
     },
     footer: {
       profile: 'All rights reserved @ React',

web/src/pages/flow/form/generate-form/index.tsx

@@ -25,7 +25,7 @@ const GenerateForm = ({ onValuesChange, form, node }: IOperatorForm) => {
       </Form.Item>
       <Form.Item
         name={['prompt']}
-        label="System"
+        label={t('systemPrompt')}
         initialValue={t('promptText')}
         tooltip={t('promptTip', { keyPrefix: 'knowledgeConfiguration' })}
         rules={[