docs(i18n): update-access-token-description (#854)

- Revised the description of access tokens to better explain their purpose and the importance of keeping them confidential.
- Ensured consistency in messaging across both English and Chinese locale files.

These changes aim to enhance user understanding of access tokens and promote best security practices.

frontend/src/locales/en_js/accessToken.js

@@ -1,6 +1,6 @@
 export const accessToken = {
   title: "User Access Token",
-  desc: "Access Token is used to authorize you to perform Git-related operations",
+  desc: "Access tokens authenticate your identity and allow applications to perform actions based on token permissions. Do not share your Access Tokens with anyone.",
   refresh: "Refresh Access Token",
   refreshWarning:
     "After refreshing, the existing Access Token will become invalid. Are you sure you want to continue?",

frontend/src/locales/zh_js/accessToken.js

@@ -1,6 +1,6 @@
 export const accessToken = {
   title: "用户 Access Token",
-  desc: "Access Token 用于授权您执行 Git 相关操作",
+  desc: "Access Tokens 主要用于验证您的身份，允许应用程序基于Token权限执行操作。请不要与任何人分享您的访问令牌。",
   refresh: "刷新 Access Token",
   refreshWarning: "刷新之后现有的 Access Token 将会失效，确认继续吗?",
   confirm: "继续刷新",