Specifically the one used on the daily challenge screen. Was bugging me
that playlists/multi have that old yellow header design used, so I've
changed it. Will probably come in handy once the footer/leaderboard
changes are in.
Also localized the headers while at it.
Multiplayer:

Playlists:

The only thing I'm wondering about is whether the detail thing
(participant count/playlist length) should be using the highlight colour
here. The old design had them be yellow, but I feel like the pink on
this one stands out too much.
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Co-authored-by: Dean Herbert <pe@ppy.sh>
Of note, this test scene still doesn't use the new footer properly.
Should these even be here? Maybe it's better to leave these real world
flows to a `Navigation` style test so we're not dealing with weird test
setups that kinda do something but don't... or maybe do it in three
different ways (two footers present, three back buttons etc.)
Dunno. But this kind of covers what I want (except it doesn't cover the
new footer usage).