i18n files in UTF8 character encoding

[dzc34]

1. Converts properties files encoded in ISO-8859-1 with Unicode escapes to properties files in UTF8 character encoding
2. using native2ascii-maven-plugin

• https://davidsimpson.me/2015/03/04/automated-native2ascii-character-conversion-internationalization-atlassian-add-ons/
• https://blog.crafting-labs.fr/2010/09/25/fichiers-properties-java-en-utf-8-avec-maven/
• https://stackoverflow.com/questions/7105039/maven-how-to-configure-native2ascii-maven-plugin?rq=1
  • http://grepcode.com/project/repo1.maven.org/maven2/org.codehaus.mojo/native2ascii-maven-plugin/