Thanks for reporting.
I was unable to find the exact string since I don't speak the language,
but I assume it would be one of these translations
https://translations.launchpad.net/ubuntu/eoan/+source/seahorse/+pots/seahorse/uk/+translate?batch=10&show=all&search=unlock.
** Also affects: ubuntu-tr
It's Xubuntu 18.04
System: Host: lenovo Kernel: 4.15.0-72-generic x86_64 bits: 64 Desktop: Xfce
4.12.3 Distro: Ubuntu 18.04.3 LTS
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https://bugs.launchpad.net/bugs/1855