german translation fix (fixes #16335)

Author: jef-n

i18n/qgis_de.ts

@@ -21208,12 +21208,12 @@ Nur %1 von %2 Objekten geschrieben.</translation>
     <message>
         <location filename="../src/gui/editorwidgets/core/qgssearchwidgetwrapper.cpp" line="71"/>
         <source>Is missing (null)</source>
-        <translation>belegt (NULL)</translation>
+        <translation>fehlt (null)</translation>
     </message>
     <message>
         <location filename="../src/gui/editorwidgets/core/qgssearchwidgetwrapper.cpp" line="73"/>
         <source>Is not missing (not null)</source>
-        <translation>Nicht belegt (NOT NULL)</translation>
+        <translation>vorhanden (nicht null)</translation>
     </message>
     <message>
         <location filename="../src/gui/editorwidgets/core/qgssearchwidgetwrapper.cpp" line="75"/>