I might be wrong, but I was under the impression that the Pageviews labs tool uses jquery.i18n. If I'm right, then I'd also expect GRAMMAR to work. However, it doesn't seem to work in https://tools.wmflabs.org/siteviews/url_structure/ when I view it in Hebrew.
Pageviews Analysis uses jquery.i18n to load messages as needed, but messages that live in the initial markup are loaded on the backend with Intuition. You have to tell Intuition to parse for magic words, but I actually am doing that here, see https://github.com/MusikAnimal/pageviews/blob/master/views/siteviews/url_structure.haml#L62. So I'm not sure what's going on, maybe a bug? I will try to see if upgrading Intuition will help.