Language-specific string resources via monkey barrels

I've made several watchfaces. Each watchface has language-specific string resources (only used for text in the settings menu). So, for example, I've created resources/strings.xml and resources-spa/strings.xml to contain string resources for English and Spanish, respectively. The string resources are the same over all watchfaces and I'd like to include them in a monkey barrel. I've made a barrel to assist making these watchfaces but when I add these language-specific string resource files to the barrel (located in their respective resources-XXX/ folder), it doesn't appear that the compiler sees them when I build the watchfaces. That is, I don't see the language I added to the barrel as an option in the properties window of the simulator when I build the watchface. Any ideas?