[dev] Questions about updating translations.

Hi lists, I have a general questions about updating translation. On OTRS4, new translation data has defined in "otrs.<lang>.po" located at "/opt/otrs/i18n/otrs". But, traditional files (/opt/otrs/Kernel/Language/<lang>[_*].pm) are also active. Because modifying them works well. So, I have 3 questions. Q1) Which file do I modify and/or update? "*.po"? "*.pm"? Both of them, Or not care? Q2) When found rack of elements for, may I add it with personal judgement? Q3) On additional module, which file do I modify? Choices are same as Q1. Please let me know. -- Hisatoshi Onishi Mail: hisatoshi.onishi@gmail.com