Initial draft of the begin component reference (#4272)

### What problem does this PR solve?

### Type of change


- [x] Documentation Update

web/src/locales/en.ts

@@ -350,7 +350,7 @@ The above is the content you need to summarize.`,
       language: 'Language',
       emptyResponse: 'Empty response',
       emptyResponseTip: `Set this as a response if no results are retrieved from the knowledge bases for your query, or leave this field blank to allow the LLM to improvise when nothing is found.`,
-      setAnOpener: 'Set an opener',
+      setAnOpener: 'Opening greeting',
       setAnOpenerInitial: `Hi! I'm your assistant, what can I do for you?`,
       setAnOpenerTip: 'Set an opening greeting for users.',
       knowledgeBases: 'Knowledge bases',
@@ -677,7 +677,7 @@ The above is the content you need to summarize.`,
       msg: 'Messages',
       messagePlaceholder: 'message',
       messageMsg: 'Please input message or delete this field.',
-      addField: 'Add field',
+      addField: 'Add option',
       addMessage: 'Add message',
       loop: 'Loop',
       loopTip:

web/src/pages/flow/form/begin-form/begin-dynamic-options.tsx

@@ -55,7 +55,7 @@ const BeginDynamicOptions = () => {
               icon={<PlusOutlined />}
               block
             >
-              Add field
+              Add option
             </Button>
             <Form.ErrorList errors={errors} />
           </Form.Item>