CREATE TABLE table_17731 ("Program" TEXT, "Degree" TEXT, "Focus" TEXT, "Teaching language" TEXT, "Duration  ( years ) " TEXT, "full-time/part-time" TEXT, "ECTS Credit Points" FLOAT)

what is teaching language where the focus is auditing?
SELECT "Teaching language" FROM table_17731 WHERE "Focus" = 'Auditing'
SELECT "Teaching language" FROM "table_17731" WHERE "Focus" = 'Auditing'