Leibniz-Institute -> Leibniz Institue in invoice footer

Change-Id: I4cec65c657d3f3a292af82c4ef0abb2ce6dc3ff9
diff --git a/invoice.php b/invoice.php
index 26edfcf..5ca3e34 100644
--- a/invoice.php
+++ b/invoice.php
@@ -94,7 +94,7 @@
 
     $invoice->addParagraph("Please transfer the total amount due to our account: ");
 
-    $invoice->addParagraph("Leibniz-Institute for the German Language
+    $invoice->addParagraph("Leibniz Institute for the German Language
 IBAN: DE70 6708 0050 0694 9411 00
 BIC: DRESDEFF670
 Commerzbank Mannheim