In edit mode, labels are not translated

In view mode, the labels for field names are displaying the value from the translations page (e.g.: $services.localization.render('ideas.ideassheet.priority') ) and when we are changing the language, you can see the proper translation.
But in edit mode the labels are displaying the prettyName of that certain fields (e.g.: $escapetool.xml($doc.displayPrettyName('priority', false, false)) ), so when we're changing the language, they're still in English.

(Functionality found in IdeasSheet.xml)