CI: check new-ep* directories

For ep28 a batch of issues were reported all at once when the directory was renamed from new-ep28_… to ep28_…, because the CI isn't active for "new" episodes. This MR activates the same checks for new episodes. For ep29, it correctly detects

Title not found in "new-ep29_Destroyer-of-Worlds/lang/en/E29P00.svg": no SVG element with id="episode-title".

(fixed on my ep29-speechbubble-pass branch).

@Deevad, would this be acceptable? I looked at your "new episode" commits, and I expect that this will not get in the way.