Tested on EmEditor v17.1.2, System language: English, EmEditor UI language: Japanese
If disable “Show Markers on Vertical Scroll Bar”, and then right click on the Vertical Scroll Bar or Horizontal Scroll Bar
Problem 1. The status bar will not show the command description.
Problem 2. Popup menu is System language, not the selected EmEditor UI language.

If enable “Show Markers on Vertical Scroll Bar”, it works fine without above problems.