ImageViewer: Rename "Go Back" and "Go Forward" actions

This commit renames "Go Back" to "Go to Previous" and "Go Forward" to
"Go to Next". This better reflects what the actions do.

Userland/Applications/ImageViewer/main.cpp

@@ -180,12 +180,12 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
             widget->navigate(ViewWidget::Directions::First);
         });
 
-    auto go_back_action = GUI::Action::create("Go &Back", { Mod_None, Key_Left }, TRY(Gfx::Bitmap::load_from_file("/res/icons/16x16/go-back.png"sv)),
+    auto go_back_action = GUI::Action::create("Go to &Previous", { Mod_None, Key_Left }, TRY(Gfx::Bitmap::load_from_file("/res/icons/16x16/go-back.png"sv)),
         [&](auto&) {
             widget->navigate(ViewWidget::Directions::Back);
         });
 
-    auto go_forward_action = GUI::Action::create("Go &Forward", { Mod_None, Key_Right }, TRY(Gfx::Bitmap::load_from_file("/res/icons/16x16/go-forward.png"sv)),
+    auto go_forward_action = GUI::Action::create("Go to &Next", { Mod_None, Key_Right }, TRY(Gfx::Bitmap::load_from_file("/res/icons/16x16/go-forward.png"sv)),
         [&](auto&) {
             widget->navigate(ViewWidget::Directions::Forward);
         });