[BUG] When login with wrong password 'undefined' and 'Request failed' appears instead of a simple 'Wrong password' message

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Prerequisites

• Put an X between the brackets on this line if you have done all of the following:
  • Read about bug reporting in general: https://rspamd.com/doc/faq.html#how-to-report-bugs-found-in-rspamd
  • Enabled relevant debugging logs: https://rspamd.com/doc/faq.html#how-to-debug-some-module-in-rspamd
  • Checked the FAQs about Core files in case of fatal crash: https://rspamd.com/doc/faq.html#how-to-figure-out-why-rspamd-process-crashed
  • Tried ASAN package and obtained the ASAN report (if possible): https://rspamd.com/doc/faq.html#asan-builds
  • Checked that your issue isn't already filed: https://github.com/issues?utf8=%E2%9C%93&q=is%3Aissue+user%3Arspamd
  • Checked that there is not already an experimental package or master branch

Describe the bug
When you login with a wrong password a 'undefined' and 'Request failed' overlay appears instead of a simple 'Wrong password' message. That would be easier to indicate an user that the password is wrong and they can retry.

Steps to Reproduce

1. Open RSpamd UI
2. Login with wrong credentials
3. Overlay appears

Expected behavior
No 'undefined' and 'Request failed' overlay should appear. Instead a wrong pasword text within or somewhere near the login prompt should appear

Versions

rspamd --version
Rspamd daemon version 3.5

x86 with AMD Ryzen 9 3900

Additional Information