Multilingual configuration and improvements #447

Job	Run time
test (ubuntu-20.04, 3.8, PyQt5~=5.12.0)	55s
test (ubuntu-20.04, 3.8, PyQt5~=5.15.0)	52s
test (ubuntu-20.04, 3.9, PyQt5~=5.14.0)	50s
test (ubuntu-20.04, 3.10, PyQt5~=5.15.0)	45s
test (ubuntu-20.04, 3.11, PyQt5~=5.15.0)	48s
test (ubuntu-20.04, 3.11, PyQt6~=6.2.3 PyQt6-Qt6~=6.2.3)	51s
test (ubuntu-22.04, 3.11, PyQt6~=6.5.0 PyQt6-Qt6~=6.5.0, glibc-tools)	59s
test (ubuntu-22.04, 3.12, PyQt6~=6.5.0 PyQt6-Qt6~=6.5.0, glibc-tools)	1m 20s
test (macos-12, 3.8, PyQt5~=5.12.0)	1m 8s
test (macos-12, 3.9, PyQt5~=5.14.0)	1m 27s
test (macos-12, 3.10, PyQt5~=5.15.0)	1m 12s
test (macos-13, 3.11, PyQt5~=5.15.0)	1m 3s
test (macos-14, 3.11, PyQt6~=6.2.3 PyQt6-Qt6~=6.2.3)	42s
test (macos-latest, 3.11, PyQt6~=6.5.0 PyQt6-Qt6~=6.5.0)	40s
test (macos-latest, 3.12, PyQt6~=6.5.0 PyQt6-Qt6~=6.5.0)	46s
test (windows-2019, 3.8, PyQt5~=5.12.0)	1m 51s
test (windows-2019, 3.9, PyQt5~=5.15.0)	2m 7s
test (windows-2019, 3.10, PyQt5~=5.15.0)	1m 46s
test (windows-2019, 3.11, PyQt5~=5.15.0)	2m 26s
test (windows-2019, 3.11, PyQt6~=6.2.3 PyQt6-Qt6~=6.2.3)	2m 13s
test (windows-2019, 3.11, PyQt6~=6.5.0 PyQt6-Qt6~=6.5.0)	2m 16s
test (windows-2019, 3.12, PyQt6~=6.5.0 PyQt6-Qt6~=6.5.0)	2m 35s
	29m 32s

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