Overriding context menu strings



Is there a guide somewhere that will tell me how to override the strings in the context menu? If not can someone explain how?

Basically the way I’m using Favourites is to maintain a list of series (eg The Saint, Homeland) that we’re currently watching and I’d like to replace the references to “Favourites” with “Watching”. Changing the main menu was a doddle but I’ve tried copying the entry from the system strings.po to the skin one, and altering the system strings.po (which I’d prefer not to do) with zero success “Add to favourites” stays stubbornly as just that.