Merge pull request #67 from zecm-via/bugfix/sorting-order-by-month

[BUGFIX] Correct sorting within the year from newest/latest to oldest

Classes/Domain/Model/Publication.php

@@ -448,7 +448,10 @@ public function setYear(string $year): self
      */
     public function getMonth(): string
     {
-        return $this->month;
+        if (!is_numeric($this->month)) {
+            return (string) (date_parse($this->month)['month'] ?: '');
+        }
+        return (string) ((int) $this->month);
     }
 
     /**