if a property file keys contain dots - the interface's methods names
generated by I18NSync also contain dots - this results in unacceptable
Java methods names.
* @gwt.key some.key
After running the i18n script, you can change the illegal method names
to whatever legal ones you would like to use for the given property.
The @gwt.key attribute maintains the association between a method and
its corresponding property name even though you change the method name.
for more information on @gwt.key and an example.
nevertheless when you need to generate a lot of methods from a large
properties file automatic dots replacement can be usefull.