Approval.

backend/de/basis.json

@@ -152,6 +152,10 @@
         "search_term": "Suchbegriff",
         "and": "Und",
         "not": "Nicht",
-        "refine_search": "Suche verfeinern"
+        "refine_search": "Suche verfeinern",
+        "exact": "Exakt",
+        "greater_than": "Gr\u00f6\u00dfer als",
+        "lower_than": "Kleiner als",
+        "empty": "Leer"
     }
 }