[Glitch] Make the button that expands the publish form differentiable from the button that publishes a post

Port 654d348aac to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/features/ui/components/header.js

@@ -36,7 +36,7 @@ class Header extends React.PureComponent {
     if (signedIn) {
       content = (
         <>
-          {location.pathname !== '/publish' && <Link to='/publish' className='button'><FormattedMessage id='compose_form.publish' defaultMessage='Publish' /></Link>}
+          {location.pathname !== '/publish' && <Link to='/publish' className='button'><FormattedMessage id='compose_form.publish_form' defaultMessage='Publish' /></Link>}
           <Account />
         </>
       );