Changing group does not update group description on Special:Translate

Steps to reproduce:

1. Go to URL.

Observed:
I. The text "This message group shows new and changed messages." is displayed in class "description". This is expected behavior.

2. Open the group selector by clicking "All".
3. Select "Blockly"

Observed:
II. The text "This message group shows new and changed messages." is still visible.

Expected:
III. Text changes to "A message group for Blockly", which is displayed if the page after (3) is reloaded.

Version: master
Severity: normal
URL: https://translatewiki.net/wiki/Special:Translate?uselang=en