Hi Jorge,
last project I was on where we had to deal with multiple languages for FICO hierarchies, we ended up logging in each language to maintain the hierarchies.
I did not personally translate FSV but did CO cost centers, profit centers, cost elements and activity type groups.
1. Log in EN => Maintain in EN => EN users will see report texts in EN
2. Log in ES => Maintain in ES => EN users will see report texts in ES
Have a try and let me know how it goes.