Change `closed_registrations_message` to `message` and add Markdown (#19486)
Change `closed_registrations_message` to `message` and add Markdown (#19486)


glitch-soc/mastodon,glitch-soc/mastodon,MitarashiDango/mastodon,yukimochi/mastodon,Ryanaka/mastodon,gol-cha/mastodon,maa123/mastodon,glitch-soc/mastodon,gol-cha/mastodon,yukimochi/mastodon,im-in-space/mastodon,theoria24/mastodon,theoria24/mastodon,maa123/mastodon,yukimochi/mastodon,MitarashiDango/mastodon,masto-donte-com-br/mastodon,im-in-space/mastodon,masto-donte-com-br/mastodon,im-in-space/mastodon,yukimochi/mastodon,gol-cha/mastodon,gol-cha/mastodon,Ryanaka/mastodon,masto-donte-com-br/mastodon,theoria24/mastodon,masto-donte-com-br/mastodon,glitch-soc/mastodon,theoria24/mastodon,MitarashiDango/mastodon,Ryanaka/mastodon,im-in-space/mastodon,maa123/mastodon,MitarashiDango/mastodon,maa123/mastodon,Ryanaka/mastodon