Hi very simple ques
Difference between Data Item Value & Data Item Label
Say you have a query item 'State' in your model. Then data item value would be any of the 52/53 (how many are there ?) States, say 'Oregon'.
With no other language than the design language defined in the model, the label would read: 'State'. Add Dutch as a user language and change the dutch label to 'Staat'. Run the report in the Dutch language and the label will read 'Staat'