Brand the webmail INBUXA: name, mark and wordmark

INBUXA is a product suite and ihasmail an independent product, so INBUXA's
webmail says INBUXA: the sign-in page, header, page title, installed-app name
and About page. The wordmark is drawn in the current text color. ihasmail's
version and AGPL source line stay as its credit. Two new strings, in all nine
catalogues; three Stalwart-only ones are no longer used.

web/src/locales/zh-Hans.ts

@@ -1222,6 +1222,8 @@ export const catalog: Catalog = {
     "Could not save filters: {error}": "无法保存过滤器：{error}",
     "Could not send the receipt: {error}": "无法发送已读回执：{error}",
     "Could not sign in.": "无法登录。",
+    "About INBUXA webmail": "关于 INBUXA 网页邮箱",
+    "Mail server": "邮件服务器",
     "You'll enter your password on your mail server's sign-in page.": "您将在邮件服务器的登录页面上输入密码。",
     "You'll sign in on your mail server's own page.": "您将在邮件服务器自己的页面上登录。",
     "This sign-in didn't start in this browser. Try again.": "此次登录不是在这个浏览器中发起的。请重试。",