feat(changelog): Add "Talk updates" entries for Talk 19

Signed-off-by: Joas Schilling <coding@schilljs.com>

lib/Chat/Changelog/Manager.php

@@ -141,6 +141,10 @@ public function getChangelogs(): array {
 			. $this->l->t('- Use the **Note to self** conversation to take notes and share information between your devices') . "\n"
 			. $this->l->t('- Captions allow to send a message with a file at the same time') . "\n"
 			. $this->l->t('- Video of the speaker is now visible while sharing the screen and call reactions are animated'),
+			$this->l->t('## New in Talk %s', ['19']) . "\n"
+			. $this->l->t('- Messages can now be edited by logged-in authors and moderators for 6 hours') . "\n"
+			. $this->l->t('- Unsent message drafts are now saved in your browser ') . "\n"
+			. $this->l->t('- *Preview:* Text chatting can now be done in a federated way with other Talk servers'),
 		];
 	}
 }