Sync IdentityError description from aspnet core

Related:
https://github.com/dotnet/aspnetcore/pull/20497/files https://github.com/abpframework/abp/pull/5300

modules/identity/src/Volo.Abp.Identity.Domain.Shared/Volo/Abp/Identity/Localization/en.json

@@ -39,13 +39,13 @@
     "Volo.Abp.Identity:ConcurrencyFailure": "Optimistic concurrency failure, object has been modified.",
     "Volo.Abp.Identity:DuplicateEmail": "Email '{0}' is already taken.",
     "Volo.Abp.Identity:DuplicateRoleName": "Role name '{0}' is already taken.",
-    "Volo.Abp.Identity:DuplicateUserName": "User name '{0}' is already taken.",
+    "Volo.Abp.Identity:DuplicateUserName": "Username '{0}' is already taken.",
     "Volo.Abp.Identity:InvalidEmail": "Email '{0}' is invalid.",
     "Volo.Abp.Identity:InvalidPasswordHasherCompatibilityMode": "The provided PasswordHasherCompatibilityMode is invalid.",
     "Volo.Abp.Identity:InvalidPasswordHasherIterationCount": "The iteration count must be a positive integer.",
     "Volo.Abp.Identity:InvalidRoleName": "Role name '{0}' is invalid.",
     "Volo.Abp.Identity:InvalidToken": "Invalid token.",
-    "Volo.Abp.Identity:InvalidUserName": "User name '{0}' is invalid, can only contain letters or digits.",
+    "Volo.Abp.Identity:InvalidUserName": "Username '{0}' is invalid, can only contain letters or digits.",
     "Volo.Abp.Identity:LoginAlreadyAssociated": "A user with this login already exists.",
     "Volo.Abp.Identity:PasswordMismatch": "Incorrect password.",
     "Volo.Abp.Identity:PasswordRequiresDigit": "Passwords must have at least one digit ('0'-'9').",