evince-previewer: "Previous Page" and "Next Page" buttons should be left and right arrows
Version: Evince 41.3-1 (RPM)
OS: Fedora Workstation 35
Currently in evince-previewer "Previous Page" is an up arrow and "Next Page" is a down arrow. Since the default view mode is non-continuous, I think it makes sense that "Previous Page" is a left arrow and "Next Page" is a right arrow. Maybe it would also make sense in continuous mode (see issue #108) if we are used to "Previous" being represented by a left arrow and "Next" by a right arrow.