Update site.php with a German translation

About time to send a German translation I'd say.

translations/de/site.php

@@ -1,24 +1,24 @@
 <?php
 
 return [
-    'Back to News' => 'Back to News',
-    'Category:' => 'Category:',
-    'Coming soon…' => 'Coming soon…',
-    'Contact' => 'Contact',
-    'Contact Us' => 'Contact Us',
-    'Development by {name}.' => 'Development by {name}.',
-    'Email:' => 'Email:',
-    'Featured Exhibits' => 'Featured Exhibits',
-    'Follow Us' => 'Follow Us',
-    'News' => 'News',
-    'Open Hours' => 'Open Hours',
-    'Phone:' => 'Phone:',
-    'Page Not Found' => 'Page Not Found',
-    'Privacy Policy' => 'Privacy Policy',
-    'Service Unavailable' => 'Service Unavailable',
-    'Scroll to the top' => 'Scroll to the top',
-    'Terms of Use' => 'Terms of Use',
-    'Top' => 'Top',
-    'Weekdays:' => 'Weekdays:',
-    'Weekend:' => 'Weekend:',
+    'Back to News' => 'Zurück zu Aktuelles',
+    'Category:' => 'Kategorie:',
+    'Coming soon…' => 'Kommt bald…',
+    'Contact' => 'Kontakt',
+    'Contact Us' => 'Kontaktiere uns',
+    'Development by {name}.' => 'Entwickelt von {name}.',
+    'Email:' => 'E-Mail:',
+    'Featured Exhibits' => 'Ausgewählte Ausstellungen',
+    'Follow Us' => 'Folge uns',
+    'News' => 'Aktuelles',
+    'Open Hours' => 'Öffnungszeiten',
+    'Phone:' => 'Telefon:',
+    'Page Not Found' => 'Seite nicht gefunden',
+    'Privacy Policy' => 'Datenschutz',
+    'Service Unavailable' => 'Service nicht verfügbar',
+    'Scroll to the top' => 'Nach oben scrollen',
+    'Terms of Use' => 'Geschäftsbedingungen',
+    'Top' => 'Hoch',
+    'Weekdays:' => 'Wochentags:',
+    'Weekend:' => 'Wochenende:',
 ];