optimizations (#2904)

* calc once, then re-use
* prevent invalid theme switch
* allow to turn off weekly-quick-entries by permissions
* remove 00:00 from date-times that likely do not need a time
* fix datepicker out of window

src/Twig/LocaleFormatExtensions.php

@@ -164,11 +164,12 @@ final class LocaleFormatExtensions extends AbstractExtension
 
     /**
      * @param DateTime|string $date
+     * @param bool $stripMidnight
      * @return bool|false|string
      */
-    public function dateTimeFull($date)
+    public function dateTimeFull($date, bool $stripMidnight = false)
     {
-        return $this->getFormatter()->dateTimeFull($date);
+        return $this->getFormatter()->dateTimeFull($date, $stripMidnight);
     }
 
     public function createDate(string $date, ?User $user = null): \DateTime