Path: Fix Slot operation translation issue

[Russ4262]

Fixes for translation issues recently introduced by upstream bug fix in translation code within the greater FreeCAD code base.
Corrections made per request by @sliptonic.

No specific forum thread for these fixes, but tangible thread is Path OPs don't work with translated UI.

Testing is needed. These fixes appear to not affect my English language usage, but I would appreciate testing by users of other languages to know if the proposed changes here do indeed fix the translation problem for the Slot operation.

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[freecadci]

for feature branch PR_6340. Pipeline 468688264 was triggered at b0977f9. All CI branches and pipelines.

[Russ4262]

Checked pipeline for error info. Found the commit that caused the error and fixed that renaming issue that I missed.

[sliptonic]

This looks great. Passes tests locally
Thanks for cleaning up the duplicate populateCombobox() stuff.

I'll merge as soon as it passes the CI check

Thanks!

[Russ4262]

Please forgive the combined Black formatting in the Slot operation fix commit. I did not think to separate out the Black formatting into a separate commit as in the past.

[freecadci]

for feature branch PR_6340. Pipeline 469288403 was triggered at 68ec48a. All CI branches and pipelines.