Right now the cross-referenc markers in the index cannot be modified. They are set to e.g. see or see also. They cannot be switched easily to another language. So everytime a document is translated those cross-reference markers need to be translated manually in the document (find & replace) which means that everytime the Index is updated or the document is translated again the markers again have to be translated.
Jean Niklaus commented
It's very ennoying the fact that the cross-referenc markers in the index cannot be modified.
I'm working in 5 lenguages, and each time I have to make a Find and Replace after indexing and verify the format.