"Carry-over" holidays is slang I think.

restrict the carrying over of unused holiday entitlement to the following holiday year only; and...
http://www.olswang.com/newsarticle.asp?sid=122&aid=1920

Provided that payment in lieu of holiday up to 5.6 weeks is not permitted, and any carry-over of unused holiday entitlement islimited to the following leave year...
http://64.233.183.104/search?q=cache:_maSyfbqaMsJ:www.berr.g...

The consultation also sought views on whether there should be an ability to carry unused holiday entitlement over to the following holiday year, and whether there should be the ability to provide payment in lieu of taking leave
http://www.theyworkforyou.com/wms/?id=2007-01-11c.22WS.4

Leave entitlement is 35 days paid holiday during the course of the leave year together with statutory Public Holidays and local discretionary holidays. Unused holiday entitlement may not be carried forward into the next leave year, except by agreement with the University. For part-time staff, the leave entitlement will be adjusted pro-rata.
http://www.brookes.ac.uk/services/hr/handbook/workinghours/l...

As far as I know there is no single English term covering all meanings of 'férias': the one or two days not worked every week (depending on whether you do a 6 or a 5-day working week), usually Saturday and Sunday; and 'public holidays' which can fall on any day of the week.

You will need to mention both 'weekends' and 'public holidays' in the translation.

'não gozadas' could be rendered as 'working on...' or ' ... not taken' - I prefer 'working on'.

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Note added at 28 mins (2008-02-07 20:37:38 GMT) Post-grading
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If, in the source text context, 'férias' includes extra-legal holiday entitlement (i.e. annual holidays exceeding the minimum legal period), this would have to be added to the English-language translation. I believe that in many (all?) EU countries employers are not allowed to give economic compensation to employees who do not take their minimum legal annual holidays.