Bump version to 2.5.3 and update changelog

CHANGELOG.md

@@ -1,5 +1,36 @@
 # novelWriter Changelog
 
+## Version 2.5.3 [2024-11-26]
+
+### Release Notes
+
+This is a patch release that fixes a a few minor bugs in the user interface, and with the HTML
+manuscript format. This patch also adds a new Russian translation, and updated the German and
+Portuguese translations.
+
+### Detailed Changelog
+
+**Bugfixes**
+
+* Fixed the red/green LEDs on the statusbar for the Default Light theme. The colours were swapped.
+  Issue 2057. PR #2059.
+* Moved the styles tag into the head tag for HTML manuscript output, which is the correct placement
+  for them. Issue #2080. PR #2085.
+* Fixed a bug in the project tree where it was possible to drag content to root level on some Qt
+  versions where the disallow flag is not obeyed. The illegal action is now additionally blocked by
+  code. Issue #2108. PR #2109.
+
+**Documentation**
+
+* Updated dead link to the spell check library. Issue #2042. PR #2059.
+
+**Internationalisation**
+
+* Russian translation added by Konstantin Tan (@k1kimosha). PR #2126
+* Updated German and Portuguese translations. PR #2126
+
+----
+
 ## Version 2.5.2 [2024-09-17]
 
 ### Release Notes