Using the application in console mode and with Spanish as language, I have realized that some text and labels have been set in English hardcoded.
For example, I have found
method "public boolean run(InstallData installData, Console console)"
text: "Select target path ["
method "public boolean More ...display()"
text: "input selection: "
I don't know if it could be more text hardcoded like that. I have found this ones at the moment.