Always use "Postfach"

Change-Id: Ifa0f2cb1678d05ca42fe5472f71b42cf016cd54f
diff --git a/inst/rmarkdown/templates/posterdown_ids/resources/template.html b/inst/rmarkdown/templates/posterdown_ids/resources/template.html
index cee265d..a01c59e 100644
--- a/inst/rmarkdown/templates/posterdown_ids/resources/template.html
+++ b/inst/rmarkdown/templates/posterdown_ids/resources/template.html
@@ -735,7 +735,7 @@
     $if(contact.name)$$contact.name$$else$Dr. Marc Kupietz$endif$<br/>
     $if(contact.department)$$contact.department$$else$$if(lang.de)$Programmbereich Korpuslinguistik$else$Corpus Linguistics PA$endif$$endif$<br/>
     Leibniz-Institut für Deutsche Sprache<br/>
-    $if(lang.de)$Postfach$else$PO Box$endif$ 10 16 21<br/>
+    Postfach 10 16 21<br/>
     68016 Mannheim<br/>
     $if(lang.de)$$else$Germany$endif$<br/>
     <br/>