improve translations in EN intro
improve translations in EN intro

rastislav-chynoransky/web-umenia-2,SlovakNationalGallery/web-umenia-2,SlovakNationalGallery/web-umenia-2,SlovakNationalGallery/web-umenia-2,SlovakNationalGallery/web-umenia-2,rastislav-chynoransky/web-umenia-2,rastislav-chynoransky/web-umenia-2