Merge pull request ppy#9410 from nanaya/discussion-cleanup

Clean up discussion reply handling

Merge pull request ppy#9399 from nanaya/remove-score-data-nulls

Remove empty mod settings and null values from score data json

Merge pull request ppy#9384 from nanaya/datadog-hostname

Add actual hostname tag to datadog

Merge pull request ppy#9380 from nanaya/interop-error-message

Add more detailed interop auth error message

Merge pull request ppy#9359 from jhdcruz/fix/disabled-search-onclick-…

…event

Fix selectable search button despite being disabled

Merge pull request ppy#9352 from nanaya/fix-user-twitter

Fix blank user twitter attribute

Merge pull request ppy#9350 from nanaya/achievement-attribute

Fix achievement attribute value

Merge pull request ppy#9339 from nanaya/explicit-user-attributes

Define user model attributes

Merge pull request ppy#9344 from nanaya/locale-cache

Cache language menu

Merge pull request ppy#9336 from nanaya/storage-disk-lazy

Delay disk storage instance initialisation