refactor(frontend): change translation files to json files #85

Job	Run time
build_and_test_backend / format	22s
build_and_test_backend / test (3.10, ubuntu-latest)	1m 31s
build_and_test_backend / test (3.11, ubuntu-latest)	1m 35s
build_and_test_backend / mypy	29s
build_and_test_backend / pylint	29s
build_and_test_frontend / build-app	6m 43s
build_and_test_frontend / build-web	1m 45s
build_and_test_frontend / format	1m 5s
build_and_test_frontend / lint	1m 11s
build_and_test_frontend / test	1m 17s
	16m 27s

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