fix: default avatar and text are always showed at first (casibase#1300)

Author: Working On It

web/src/chat/WelcomeHeader.js

@@ -14,18 +14,16 @@
 
 import React from "react";
 import {Welcome} from "@ant-design/x";
-import * as Setting from "../Setting";
-import i18next from "i18next";
 
 const WelcomeHeader = ({store}) => {
-  const avatar = store?.avatar || Setting.AiAvatar;
+  const avatar = store?.avatar || null;
 
   return (
     <Welcome
       variant="borderless"
       icon={avatar}
-      title={store?.welcomeTitle || i18next.t("chat:Hello, I'm Casibase AI Assistant")}
-      description={store?.welcomeText || i18next.t("chat:I'm here to help answer your questions")}
+      title={store?.welcomeTitle || null}
+      description={store?.welcomeText || null}
     />
   );
 };