Language Substitution with Field

Hi,

I need to change the language key "UE_EDIT_TITLE" in plugins and translate it to something like "Edit profile of [username]" but it doesn't work. I was referring to this help file: www.joomlapolis.com/documentation/18353-using-substitutions-throughout-cb

I tried [USERNAME], [cb:userfield field="USERNAME" /] however it doesn't work in the frontend. What am I doing wrong?

That language string is not passed through substitutions. You will not be able to substitute in their username. It should however show their formatname field value if the user editing them is someone other than themselves as that's built in using sprintf and the UE_EDIT_OTHER_USER_TITLE language string.