On the user interface translation page the outline of all four focusable elements in the filter translatable strings fieldset lacks the left border

Problem/Motivation

On admin/config/regional/translate the four focusable elements (string contains, translation language, search in and the filter button) inside the filter translatable string fieldset miss the left border of the focus outline - or maybe it is covered by another element.

*Tested with Safari 13.1.2 and Firefox 97.0.1 on MacOS 10.13.6

Steps to reproduce

- Install the Language and the Interface Translation module
- Add a second language
- Go to admin/config/regional/translate