That is an interesting question you are asking. From what I have seen, ETL tools are translated in many languages.
Talend has an interesting project on Talend Open Studio as it has its community at work. Through Babili, the name of the project, users can translate their ETL tool.
As I speak, Chinese is on its way to be translated at 100%. Talend Open Studio is also being translated in other languages.
You can look at the project here: http://www.talendforge.org/babili/ . The website is: http://www.talend.com/ .