Bump version to v4.1.5 (#26108)

Favourits -> Favorites (#26109)

Override default Action Mailer `preview_path` (#26110)

Replace 'favourite' by 'favorite' for American English (#26009)

Fix linting issue (#26106)

Fix CSP headers being unintendedly wide (#26105)

Use username as display name for suspended users or users with blank display names (#25276)

change focus ui for keyboard only input (#25935)

Change default KeyGenerator digest to SHA1 to fix cookies in rolling upgrades (#26023)

Change thread view to scroll to the selected post rather than the post being replied to (#24685)

Clean up unused application records (#24871)

Fix replica being used even if not explicitly defined (#26074)

Fix the crossorigin attribute (#26096)

Improve the bug report templates (#25621)

Add stricter protocol fields validation for accounts (#25937)

Fix `Lint/Void` cop (#25922)

Fix haml-lint Rubocop `Lint/UnusedBlockArguments` cop (#26039)

Move localized subject mailer shared example to separate file (#25889)

Change casing for 'Server Settings' string (#26011)

Fix haml-lint Rubocop `Style/NumericPredicate` cop (#26040)