Currently SolidWorks has no built-in functionality to do this.
However my company is developing the tool to translate (localize) SolidWorks files (in fact not only the feature tree but also annotations, custom properties and other text items). This tool should solve your task exactly. It has a lot of other useful features such as auto localization, translation through custom, global and on-line dictionaries etc., specifying the groups to translate (feature items, annotations, title block, configurations, custom properties etc). This tool is in Beta 1 period now. If you like to give it a try and participate in trialing please send a request e-mail to email@example.com. Mark it as "Attention Artem Taturevych".
Application Engineer at Intercad
Tel: +61 2 9454 4444
thanks a lot!