English: LEVEL : level of severity (<code>CRITICAL</code>, <code>HIGH</code> or <code>MEDIUM</code>), information (<code>INFO</code>, <code>UPLOAD</code>) and debugging mode (<code>DEBUG_ON</code>).
Dutch: NIVEAU: niveau van ernst (<code>CRITICAL</code>, <code>HIGH</code> of <code>MEDIUM</code>), informatie (<code>INFO</code>, <code>UPLOADEN</code>) en debugging modus (<code>DEBUG_ON</code>).