Light mode:
* Change child post border from orange back to dark yellow (still darker
than previous yellow).
* Make flagged borders brighter red.
* Make admins brighter red.
* Make parent, child, and pending post notice bars brighter.
* Change copyright tags from purple to magenta (very close to copyright
tag color from before).
* Darken forum topic new/approved/rejected labels.
Dark mode:
* Make platinum users brighter grey.
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