Fill in release date for 2.14

CHANGELOG.txt

@@ -12,7 +12,7 @@ Changelog
  * Fix: InlinePanel add button is now keyboard navigatable (Jesse Menn)
 
 
-2.14 (xx.xx.xxxx) - IN DEVELOPMENT
+2.14 (02.08.2021)
 ~~~~~~~~~~~~~~~~~
 
  * Removed support for Django 2.2

docs/releases/2.14.rst

@@ -1,6 +1,6 @@
-===========================================
-Wagtail 2.14 release notes - IN DEVELOPMENT
-===========================================
+==========================
+Wagtail 2.14 release notes
+==========================
 
 .. contents::
     :local: