Add some TranslationTable javadoc #2672

Job	Run time
build (macos-latest)	2m 48s
java_matrix	2s
build (ubuntu-latest)	2m 58s
download_test_data	3s
unit_tests (25)	3m 49s
unit_tests (21)	3m 20s
test_clara	4m 37s
test_run-groovy	50s
test_decoder	2m 14s
test_coatjava (ubuntu-latest, eb-ep)	2m 53s
spotbugs	7m 17s
test_coatjava (macos-latest, eb-ep, ./run-eb-tests.sh -100 electronproton)	2m 56s
test_coatjava (ubuntu-latest, eb-eftpi)	2m 2s
test_coatjava (ubuntu-latest, eb-epc)	2m 12s
test_coatjava (ubuntu-latest, eb-eg)	2m 8s
test_coatjava (ubuntu-latest, eb-enc)	2m 33s
test_coatjava (ubuntu-latest, kpp)	3m 2s
release_build	0s
generate_documentation	1m 3s
deploy_web_pages	-1s
final	4s
	46m 50s

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