Fix basic functionality limits and bugs in galleries
The 'slideshow' gallery currently only allows you to choose the transition for the autotransition. When you disable autotransition to only use the navigation buttons/arrows, our choice of transition is ignored, and we are stuck with a slide left when the arrows are clicked. Our choice should apply to all methods of transition.
Also, with the full-page lightbox popups for galleries, two arrows appear to navigate while in full screen. However, these arrows don't always work, no matter how big/small/full/empty your slideshow or page is so it's not simply an overloaded page. Please fix this bug, it's misleading.