Adapted system feedback when uploading too large documents

. Added clientside check to avoid uploads > 8MB size
. Adapted message returned by server, when max upload size is exceeded

application/controllers/lehre/anrechnung/RequestAnrechnung.php

@@ -119,7 +119,7 @@ class requestAnrechnung extends Auth_Controller
 		// Validate data
 		if (empty($_FILES['uploadfile']['name']))
 		{
-			return $this->outputJsonError($this->p->t('ui', 'errorUploadFehlt'));
+			return $this->outputJsonError($this->p->t('ui', 'errorUploadFehltOderZuGross'));
 		}
 
 		if (isEmptyString($begruendung_id) ||

application/views/lehre/anrechnung/requestAnrechnung.php

@@ -26,7 +26,8 @@ $this->load->view(
                 'neu',
 				'maxZeichen',
                 'errorBestaetigungFehlt',
-				'systemfehler'
+				'systemfehler',
+                'errorDokumentZuGross'
 			),
 			'anrechnung' => array(
 				'deadlineUeberschritten',