Properties Editor (Java i18n tool) is the tool for Java products internationalization. The editor has easy interface and ability of working with languages, different from english. WYSIWYG.

Not the secret that .properties files, stores the strings, not unicode, so ordinary editors can not normally display, for example, russian text from those files. Is seems so:

PnlLogin.2=\u041F\u0430\u0440\u043E\u043B\u044C
PnlLogin.1=\u0421\u0435\u0440\u0432\u0435\u0440

Is is very bad for any project you work on. Propties Editor (Java i18n tool) will help you to save much time!

The product also will let you to work with many Java packages one time.