Field Label translation works on classic form but in workspace view, it disappears for few fields

[Jiaveria]

I have created record in sys_documentation table, and after debugging I can view translated field label of a custom field in classic form view, but in  workspace it disappears for few fields.

[Jiaveria]

It worked, after doing cache.do.
Thankyou!

Does sys_ui_message consider the application scope? For a specific use case, I want to override the default French translation and display a custom value on portal widget. The key remains the same, but it should return translation from my custom record created in  my application scope instead of the default translation.
One can suggest to delete OOTB translation or update it, but that will work for entire instance instead of just working for my custom app scope.