fix: update json

Author: cvnert

src/i18n/en/user.json

@@ -8,6 +8,6 @@
     "passwordRequirements": "Password must contain at least one letter and one number",
     "emailAlreadyInUse": "Email already in use",
     "provideVerificationCode": "Please provide verification code",
-    "userCannotbeEmptyStr": "Username cannot be emptyStr"
+    "userCannotbeEmptyStr": "Please enter a valid username; only spaces are not allowed."
   }
 }

src/i18n/zh/user.json

@@ -8,6 +8,6 @@
     "passwordRequirements": "密码必须包含至少一个字母和一个数字",
     "emailAlreadyInUse": "邮箱已被使用",
     "provideVerificationCode": "请提供邮箱验证码",
-    "userCannotbeEmptyStr": "用户名不能为空字符串"
+    "userCannotbeEmptyStr": "请输入有效用户名，不能仅输入空格"
   }
 }