core: display login in caption

user_id are technical things that should not be displayed to users.

In the case of tokens, for now we show "something that's not user id / not the
token secret". That's not ideal but as far as I know whe don't really have use
cases of tokens to show a page where user caption would be displayed.
2 jobs for <span class="ref-name">fix/user_id_breadcrumb</span> in 0 seconds
Status Job ID Name Coverage
  External
passed ERP5.CodingStyleTest-TestRunner1

00:38:50

passed ERP5.UnitTest-TestRunner1

01:36:36