Incorrect Polish translation for 'Due Date' field in JiraWebActionSupport_pl_PL.properties file

There is a mismatch translation in the 'Due Date' field in Polish language pack. This happens in the 'issue field names' and 'issue column headings'. For example, these are the translations in the JiraWebActionSupport_pl_PL.properties file:

# issue field names
issue.field.duedate = Planowana Data Zako\u0144czenia

# issue column headings
issue.column.heading.duedate = Wa\u017cne

'Ważne' actually means 'important' in the Polish language (not due date). This would be good to have a correct translation of it so that the customer would not get confused of it.