Add language setting and translation function #419

Job	Run time
test (ubuntu-20.04, 3.8, PyQt5~=5.12.0)	46s
test (ubuntu-20.04, 3.7, PyQt5~=5.15.0)	1m 2s
test (ubuntu-20.04, 3.8, PyQt5~=5.15.0)	1m 13s
test (ubuntu-20.04, 3.9, PyQt5~=5.14.0)	43s
test (ubuntu-20.04, 3.10, PyQt5~=5.15.0)	42s
test (ubuntu-20.04, 3.11, PyQt5~=5.15.0)	37s
test (ubuntu-20.04, 3.11, PyQt6~=6.2.3 PyQt6-Qt6~=6.2.3)	53s
test (ubuntu-22.04, 3.11, PyQt6~=6.5.0 PyQt6-Qt6~=6.5.0, glibc-tools)	42s
test (ubuntu-22.04, 3.12, PyQt6~=6.5.0 PyQt6-Qt6~=6.5.0, glibc-tools)	56s
test (macos-11, 3.8, PyQt5~=5.12.0)	1m 47s
test (macos-11, 3.9, PyQt5~=5.14.0)	1m 55s
test (macos-11, 3.10, PyQt5~=5.15.0)	1m 47s
test (macos-12, 3.11, PyQt5~=5.15.0)	46s
test (macos-12, 3.11, PyQt6~=6.2.3 PyQt6-Qt6~=6.2.3)	1m 8s
test (macos-12, 3.11, PyQt6~=6.5.0 PyQt6-Qt6~=6.5.0)	49s
test (macos-12, 3.12, PyQt6~=6.5.0 PyQt6-Qt6~=6.5.0)	57s
test (windows-2019, 3.8, PyQt5~=5.12.0)	2m 24s
test (windows-2019, 3.9, PyQt5~=5.15.0)	1m 34s
test (windows-2019, 3.10, PyQt5~=5.15.0)	2m 17s
test (windows-2019, 3.11, PyQt5~=5.15.0)	2m 2s
test (windows-2019, 3.11, PyQt6~=6.2.3 PyQt6-Qt6~=6.2.3)	2m 3s
test (windows-2019, 3.11, PyQt6~=6.5.0 PyQt6-Qt6~=6.5.0)	1m 22s
test (windows-2019, 3.12, PyQt6~=6.5.0 PyQt6-Qt6~=6.5.0)	1m 21s
	29m 46s

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