Yeah, this should show up. I'd probably, at least temporarily, just use standard strings for the text instead of the resource files, to get rid of another possible issue. But my guess is if you're seeing the page, but not seeing this new content, then
your solution isn't deploying properly to your site collection and i'd look at that. You can always check if the updated file ended up in the correct folder on the server (because if it did, that's what should be getting served).