What file holds the "Invalid username" message?

Question

In trying to prevent username enumeration, I'm editing login messages to obfuscate whether the username or password was incorrect. I've successfully edited the messages for when the password is wrong, but I cannot track down where the "Invalid username" message pictured below is stored.

I've edited myaccount_lang.php, but it's had no effect on this output. I've searched for "Invalid username" on my /system/ folder, and updated the message anywhere I've seen it, but to no success. (The only other file I found it in was moblog_lang.php, just to be clear.)

What am I missing?

Answer 1

Take a look in system/expressionengine/language/english/login_lang.php

Answer 2

Rather than hacking the core or using speciality templates, use Custom System Messages. It's great and super easy to use