fix: Update user/accounts/username column to 'Login Name'

ui/core/app/templates/scopes/scope/users/user/accounts.hbs

@@ -6,7 +6,7 @@
     <table.header as |header|>
       <header.row as |row|>
         <row.headerCell>{{t 'form.name.label'}}</row.headerCell>
-        <row.headerCell>{{t 'form.username.label'}}</row.headerCell>
+        <row.headerCell>{{t 'form.login_name.label'}}</row.headerCell>
         <row.headerCell>{{t 'form.id.label'}}</row.headerCell>
         <row.headerCell>{{t "titles.actions"}}</row.headerCell>
       </header.row>