Fix until date in event recurrence editor

- fixed date picker
- fixed JavaScript error caused by French translation
- fixed until date definition when timezone of active user was different
  from the system timezone
- fixes #2173, fixes #2175

UI/WebServerResources/UIxRecurrenceEditor.css

@@ -20,7 +20,7 @@ DIV#windowButtons
 DIV#pageContent
 { padding: 1em; }
 
-TABLE TH
+TABLE.frame TH
 { font-weight: normal;
   text-align: right;
   width: 5em; }