Implement "conversation lock" for issue comments (#5073)

docs/content/doc/advanced/config-cheat-sheet.en-us.md

@@ -71,6 +71,9 @@ Values containing `#` or `;` must be quoted using `` ` `` or `"""`.
 - `WORK_IN_PROGRESS_PREFIXES`: **WIP:,\[WIP\]**: List of prefixes used in Pull Request
  title to mark them as Work In Progress
 
+### Repository - Issue (`repository.issue`)
+- `LOCK_REASONS`: **Too heated,Off-topic,Resolved,Spam**: A list of reasons why a Pull Request or Issue can be locked
+
 ## UI (`ui`)
 
 - `EXPLORE_PAGING_NUM`: **20**: Number of repositories that are shown in one explore page.

docs/content/doc/features/comparison.en-us.md

@@ -81,7 +81,7 @@ _Symbols used in table:_
 | Related issues | ✘ | ✘ | ⁄ | ✘ | ✓ | ✘ | ✘ |
 | Confidential issues | ✘ | ✘ | ✘ | ✓ | ✓ | ✘ | ✘ |
 | Comment reactions | ✓ | ✘ | ✓ | ✓ | ✓ | ✘ | ✘ |
-| Lock Discussion | ✘ | ✘ | ✓ | ✓ | ✓ | ✘ | ✘ |
+| Lock Discussion | ✓ | ✘ | ✓ | ✓ | ✓ | ✘ | ✘ |
 | Batch issue handling | ✓ | ✘ | ✓ | ✓ | ✓ | ✘ | ✘ |
 | Issue Boards | ✘ | ✘ | ✘ | ✓ | ✓ | ✘ | ✘ |
 | Create new branches from issues | ✘ | ✘ | ✘ | ✓ | ✓ | ✘ | ✘ |