Use lombok's @Data instead of @Setter and @Getter.

Reduce the size of our entity code even further.
Merge branch 'tm-import' of github.com:zanata/zanata into tm-import

Conflicts:
	zanata-model/src/main/java/org/zanata/model/tm/TMTransUnitVariant.java
	zanata-model/src/main/java/org/zanata/model/tm/TMTranslationUnit.java
	zanata-model/src/main/java/org/zanata/model/tm/TransMemory.java
Correct tests and change UI messages.