Externalize all messages

[rawagner]

[geetikabatra]

@rawagner, I would appreciate a little more information on this.
Thanks in advance. :)

[rawagner]

It's about http://www.vogella.com/tutorials/EclipseInternationalization/article.html

Basically we should create
Messages.properties - this file will contain all string messages
Messages.java - String variables which values are initiated with values from Messages.properties
and then use Messages.java variables in code