Update column captions to "Processed on" in frmMain.resx

Changed "Abgeschlossen am" to "Bearbeitet am" for ColSignedDateCompleted and ColSignedDate captions to better reflect the status as "Processed on" instead of "Completed on".

EnvelopeGenerator.Form/frmMain.resx

@@ -723,7 +723,7 @@
     <value>XtraTabControlMain</value>
   </data>
   <data name="ColSignedDateCompleted.Caption" xml:space="preserve">
-    <value>Unterschrieben am</value>
+    <value>Bearbeitet am</value>
   </data>
   <data name="&gt;&gt;btnEnvelopes_thisYear.Type" xml:space="preserve">
     <value>DevExpress.XtraEditors.SimpleButton, DevExpress.XtraEditors.v21.2, Version=21.2.4.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a</value>
@@ -1829,7 +1829,7 @@
     <value>Panel1</value>
   </data>
   <data name="ColSignedDate.Caption" xml:space="preserve">
-    <value>Unterschrieben am</value>
+    <value>Bearbeitet am</value>
   </data>
   <data name="&gt;&gt;ViewHistory.Name" xml:space="preserve">
     <value>ViewHistory</value>