fix(property-editor): use QLocale territory API

[wyzula-jan]

Description

This should remove 12k warnings from unit tests.

Related Issues

• closes [BUG]: Warnings during CI #870

[Copilot]

Pull request overview

Updates the property editor’s locale handling to use Qt6’s territory-based QLocale APIs, addressing CI noise from deprecation warnings (Issue #870).

Changes:

• Replaces deprecated QLocale.countryToString(...) with QLocale.territoryToString(...).
• Switches current-locale selection from loc.country() to loc.territory().

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[github-actions]

Benchmark comparison

Threshold: 20% (lower is better).
Result: 0 regression(s), 0 improvement(s) beyond threshold.

No benchmark regression exceeded the configured threshold.

No benchmark improvement exceeded the configured threshold.

All benchmark results

Benchmark	Baseline	Current	Change	Status
BEC IPython client with companion app	5.92433 s	6.65248 s	+12.29%	ok
BEC IPython client without companion app	2.05344 s	2.03803 s	-0.75%	ok
Import bec_widgets	0.0130751 s	0.0131033 s	+0.22%	ok
tests/unit_tests/benchmarks/test_dock_area_benchmark.py::test_add_waveform_to_dock_area	0.153234 s	0.159179 s	+3.88%	ok

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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