Sprachenzählung; Demography (linguistics) ; Language census ; Multilingualism; Polylingualism; Plurilingualism ; Spanien (engl. Sprache in) ; Spain (English language in) ; English in Spain ; Old Spanish ; Kaló; Caló; Zigeunersprache; Vlach-Romanī; Tsigane; Gypsy language ; Euskara; Basque