Nice to have
There should be a test that verifies that translations exist for all I18NConstants.
TestI18NConstantsTranslations tests all I18NConstants that are not loaded from a jar. This is chosen so that when testing tl-element the I18NConstants of tl-core are not tested again.
In tl-basic delete a translation of an I18NConstants and execute TestI18NConstantsTranslations. This test must fail.