Sentence:  As they explain, 'the <WSD>literary language</WSD> is first of all a collection of expressive habits and customs, and to preserve the purity of the <WSD>literary language</WSD> can mean nothing other than to preserve these habits and customs' (Guberina and Krsic/ 1940: 77). 
Meaning of the word marked with <WSD> tags:  A language variety used as an institutional norm in a community, opposed to vernacular dialects; a standard language.<ref name=:0>(url=https://books.google.com/books?id=1TtvBAAAQBAJ)</ref><ref>H. Schuster-S̆ewc, "Grammar of the Upper Sorbian Language: Phonology and Morphology", Lincom Europa, 1996, p. 249, (978-3-89586-0591)</ref>