YOU SAID:
https://www.google.com/preferences?hl=en&sa=X&ved=0ahUKEwjXkYXy1PjiAhUtIDQIHXdfCXwQn5cCCAo
INTO JAPANESE
https://www.google.com/preferences?hl=ja&sa=X&ved=0ahUKEwjXkYXy1PjiAhUtIDQIHXdfCXwQn5cCCAo
BACK INTO ENGLISH
https://www.google.com/preferences?hl=en&sa=X&ved=0ahUKEwjXkYXy1PjiAhUtIDQIHXdfCXwQn5cCCAo
INTO JAPANESE
https://www.google.com/preferences?hl=ja&sa=X&ved=0ahUKEwjXkYXy1PjiAhUtIDQIHXdfCXwQn5cCCAo
BACK INTO ENGLISH
https://www.google.com/preferences?hl=en&sa=X&ved=0ahUKEwjXkYXy1PjiAhUtIDQIHXdfCXwQn5cCCAo
You've done this before, haven't you.