Fix language dropdown sometimes not appearing in web UI (#19246)
Fix language dropdown sometimes not appearing in web UI (#19246)

When user has no locale preference saved (such as never changing it
from the default), the preferred posting language is nil, and
the dropdown is not visible
musashino205/mastodon,gol-cha/mastodon,theoria24/mastodon,glitch-soc/mastodon,Ryanaka/mastodon,musashino205/mastodon,glitch-soc/mastodon,im-in-space/mastodon,yukimochi/mastodon,musashino205/mastodon,masto-donte-com-br/mastodon,gol-cha/mastodon,masto-donte-com-br/mastodon,Ryanaka/mastodon,musashino205/mastodon,yukimochi/mastodon,im-in-space/mastodon,gol-cha/mastodon,masto-donte-com-br/mastodon,maa123/mastodon,theoria24/mastodon,glitch-soc/mastodon,gol-cha/mastodon,Ryanaka/mastodon,yukimochi/mastodon,maa123/mastodon,MitarashiDango/mastodon,Ryanaka/mastodon,im-in-space/mastodon,maa123/mastodon,glitch-soc/mastodon,MitarashiDango/mastodon,MitarashiDango/mastodon,yukimochi/mastodon,masto-donte-com-br/mastodon,theoria24/mastodon,maa123/mastodon,theoria24/mastodon,im-in-space/mastodon,MitarashiDango/mastodon