Mobile fixes (#1539)

* Make new tag, gallery and studio pages mobile friendly
* Enable new button on mobile
* Update movies edit HTML to be more in line with scene

Update the code of the MovieEditPanel to be more in sync with the
SceneEditPanel. Changes made are:
 * Use FormUtil.renderLabel instead of manually building
 * Always apply xs=9 breakpoint

This fixes some layout issues on mobile while still looking the same on
tablet and desktop resolution.

* Enable delete button for tags, studios and movies on mobile
* Add changelog

Co-authored-by: WithoutPants <53250216+WithoutPants@users.noreply.github.com>

ui/v2.5/src/components/MainNavbar.tsx

@@ -285,7 +285,7 @@ export const MainNavbar: React.FC = () => {
           </Fade>
         </Navbar.Collapse>
         <Nav className="order-2 flex-row">
-          <div className="d-none d-sm-block">{newButton}</div>
+          <div>{newButton}</div>
           <Nav.Link
             href="https://opencollective.com/stashapp"
             target="_blank"