remove unused keywords from test data set
remove unused keywords from test data set

Signbank/BSL-signbank,Signbank/BSL-signbank,Signbank/Auslan-signbank,Signbank/BSL-signbank,Signbank/Auslan-signbank,Signbank/Auslan-signbank,Signbank/BSL-signbank,Signbank/Auslan-signbank