Bug 325519: Better readable error dialog. r=jminta

calendar/locales/en-US/chrome/calendar/calendar.properties

@@ -239,6 +239,8 @@ contentError=This doesn't appear to be a valid file. Here's what I got back from
 readOnlyMode=There has been an error reading data for calendar: %1$S. It has been placed in read-only mode, since changes to this calendar will likely result in data-loss.  You may change this setting by choosing 'Edit Calendar'.
 minorError=There has been an error reading data for calendar: %1$S.  However, this error is believed to be minor, so the program will attempt to continue.
 stillReadOnlyError=There has been an error reading data for calendar: %1$S.
+utf8DecodeError=An error occured while decoding an iCalendar (ics) file as UTF-8. Check that the file, including symbols and accented letters, is encoded using the UTF-8 character encoding.
+icsMalformedError=Parsing an iCalendar (ics) file failed. Check that the file conforms to iCalendar (ics) file syntax.
 
 # LOCALIZATION NOTE (likelyTimezone):
 #    Translators, please put the most likely timezone that the people using your