History of linguistics (19th century) ; History of linguistics (20th century) ; Swiss German (second language teaching) ; Lehrerausbildung; Teacher training; Lehrerfortbildung; In-service teacher training; Teacher education ; Mother tongue (teaching of) ; Switzerland (German language in) ; Schweiz (dt. Sprache in der) ; Deutsch in der Schweiz; German in Switzerland; Swiss German ; Schweiz (fr. Sprache in der) ; Switzerland (French language in) ; French in Switzerland