Add title to pages with missing title in Web UI (#19322)

app/javascript/mastodon/containers/mastodon.js

app/javascript/mastodon/features/about/index.js

...javascript/mastodon/features/account/components/header.js

...javascript/mastodon/features/bookmarked_statuses/index.js

app/javascript/mastodon/features/community_timeline/index.js

app/javascript/mastodon/features/direct_timeline/index.js

app/javascript/mastodon/features/directory/index.js

app/javascript/mastodon/features/explore/index.js

app/javascript/mastodon/features/explore/results.js

...javascript/mastodon/features/favourited_statuses/index.js

app/javascript/mastodon/features/favourites/index.js

app/javascript/mastodon/features/getting_started/index.js

app/javascript/mastodon/features/hashtag_timeline/index.js

app/javascript/mastodon/features/home_timeline/index.js

app/javascript/mastodon/features/list_timeline/index.js

app/javascript/mastodon/features/lists/index.js

app/javascript/mastodon/features/notifications/index.js

app/javascript/mastodon/features/privacy_policy/index.js

app/javascript/mastodon/features/public_timeline/index.js

app/javascript/mastodon/features/status/index.js