Fix License Header in Translator Sub Module

The source code files in the translator sub module do not contain a proper EPL-2.0 license header. This should be fixed
Example file is this, but I checked several more and all files I have seen do not have a license header.

https://github.com/eclipse-arrowhead/core-java-spring/blob/master/translator/src/main/java/eu/arrowhead/core/translator/TranslatorMain.java