Please see this forum thread for some information.
In summary, there is no automatic translation mechanism in SOLIDWORKS for this. In that thread above, someone has posted information about a macro that may help. I also remember someone posting on this forum a link to a for purchase add-in that could also do it, but I cannot find it at this time. I will update my post with that information if I find it, but someone else may remember or know information about the add-in and post about it.
Thanks for the macro. It works great. As you can see the names changed but the error message is sowing in French.
I really do not care about the tree naming as I can tell what it is by the icon. But I do not have enough experiences in solidworks to know what the warning says.
I am running an English installation opening French models.