[repo] Add code freeze date to releases page

Author: andrewnicols

src/theme/UnsupportedVersionBanner/index.js

@@ -112,6 +112,18 @@ function FutureReleaseWarning({ versionData }) {
                     This version of Moodle has not yet been released.
                 </Translate>
             </strong>
+
+            <br />
+
+            <Translate
+                description="A message to inform of the code freeze date"
+                id="documentation.support.freezeDate"
+                values={{
+                    date: versionData.codeFreezeDate,
+                }}
+            >
+                {' The code freeze date for this release is {date}.'}
+            </Translate>
         </Admonition>
     );
 }