Rename personal Groupware settings section to "Availability"

But leave the internal identifier untouched.

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

apps/dav/img/LICENSES.md

@@ -0,0 +1,6 @@
+# Licenses
+
+## schedule.svg
+- Created by: Google
+- License: Apache License, Version 2.0
+- Link: https://fonts.google.com/icons?selected=Material%20Icons%3Aschedule%3A

apps/settings/lib/Sections/Personal/Groupware.php

@@ -41,15 +41,15 @@ public function __construct(IL10N $l, IURLGenerator $urlGenerator) {
 	}
 
 	public function getIcon(): string {
-		return $this->urlGenerator->imagePath('core', 'places/contacts.svg');
+		return $this->urlGenerator->imagePath('dav', 'schedule.svg');
 	}
 
 	public function getID(): string {
 		return 'groupware';
 	}
 
 	public function getName(): string {
-		return $this->l->t('Groupware');
+		return $this->l->t('Availability');
 	}
 
 	public function getPriority(): int {