Adapted system feedback when uploading too large documents

. Added clientside check to avoid uploads > max upload size on serverside
. 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',
@@ -179,7 +180,7 @@ $this->load->view(
 										<div class="form-inline panel-body">
 											<div class="form-group">
 												<input type="file" id="requestAnrechnung-uploadfile"
-													   name="uploadfile" accept=".pdf" size="50"
+													   name="uploadfile" accept=".pdf" size="50" data-maxsize="<?php echo (int)ini_get('upload_max_filesize') * 1024 ?>"
 													   required>
 											</div>
 											<span id="requestAnrechnung-uploadTooltip" data-toggle="tooltip" data-placement="right"