Update changelog from 3.1.4

(cherry picked from commit 97f21c0f)

CHANGELOG.rst

@@ -6,8 +6,8 @@ All notable changes to this project will be documented in this file.
 The format is based on `Keep a Changelog`_,
 and this project adheres to `Semantic Versioning`_.
 
-`3.1.3`_ – 2023-07-18
----------------------
+Unreleased
+----------
 
 Changes
 =======
@@ -42,6 +42,13 @@ Fixed
 * Group GraphQL queries failed when queried by owner or member.
 * Nav submenu items could not be distinguished from regular ones.
 
+`3.1.4`_ - 2023-07-20
+---------------------
+
+Fixed
+~~~~~
+
+* Extensible form was broken due to a missing import.
 
 `3.1.3`_ – 2023-07-18
 ---------------------
@@ -1244,3 +1251,4 @@ Fixed
 .. _3.1.1: https://edugit.org/AlekSIS/official/AlekSIS-Core/-/tags/3.1.1
 .. _3.1.2: https://edugit.org/AlekSIS/official/AlekSIS-Core/-/tags/3.1.2
 .. _3.1.3: https://edugit.org/AlekSIS/official/AlekSIS-Core/-/tags/3.1.3
+.. _3.1.4: https://edugit.org/AlekSIS/official/AlekSIS-Core/-/tags/3.1.4