I used both UTF-8 and UTF-8 BOM encodings. Japanese source text appeared garbled in both the production editor and the alpha editor. Please see the attached source file for details; below is an excerpt.
The garbled characters are shown in the screenshot below.
This happened on a private project I recently created (my first), at https://translate.zanata.org/webtrans/translate?project=LIFERAY&iteration=0.1&localeId=en-US&locale=en-US&dswid=-5817#view:doc;doc:Language_ja.
Windows 10 (Version 1803 Build 17134.472)