Changes

Only play the unlock sound once for batched rank unlock notifications

Mass level changes like /mmoedit all queue dozens of staggered unlock
notifications, each of which played the unlock sound. A per player
quiet window anchored on the last notification now lets the first
sound through and keeps the rest of the stream silent; the messages
themselves are unchanged. External callers of the existing
NotificationManager method keep the always-play behavior through a
new overload.
 (commit: f7bad80)

Stream skill rank unlock notifications one at a time per player
 (commit: 615e5c8)

Tell players which Salvage requirements they are missing at the salvage anvil
 (commit: 6ac5834)

Announce region backups before the per-world backup log lines
 (commit: d305d52)

Fix XP command tab completion suggesting skill names for the value argument
 (commit: 9cae4d9)

Resolve PlaceholderAPI placeholders in level up commands
 (commit: 610445e)

Show the capitalized Overhaul.Name skill names in player messages

SkillTools.getLocalizedSkillName now reads the Overhaul.Name locale
entries; the all-caps SkillName values move behind the new
SkillTools.getHeaderBannerSkillName, which stylized headers,
scoreboards, and skill command matching keep using.
 (commit: b3e818f)

Remove the Hylian Luck message and dead locale entries from shipped locales
 (commit: 8fa9610)

Add PlaceholderAPI placeholders for localized skill names
 (commit: 0c8337b)

Update changelog
 (commit: 35ec12e)