Refactor task status handling and update styles for task views; add support for 'faktury' status

templates/tasks/task_popup.php

@@ -67,7 +67,7 @@
         <h3>Status</h3>
         <div class="current_status">
           <select name="task_status" class="form-control" task_id="<?= $this -> task['id'];?>">
-            <? foreach ( \factory\Tasks::$statuses as $key => $status ):?>
+            <? foreach ( \factory\Tasks::get_statuses() as $key => $status ):?>
               <option value="<?= $key;?>" <? if ( $this -> task['status'] == $key ):?>selected="selected"<? endif;?>><?= $status;?></option>
             <? endforeach;?>
           </select>