Changed devise localisation to show username for incorrectly entered details, rather than email
Changed devise localisation to show username for incorrectly entered details, rather than email

doubtfire-lms/doubtfire-api,jakerenzella/doubtfire-api,doubtfire-lms/doubtfire-api,alexcu/doubtfire-api,jakerenzella/doubtfire-api,doubtfire-lms/doubtfire-api,final-year-project/doubtfire-api,alexcu/doubtfire-api,final-year-project/doubtfire-api,final-year-project/doubtfire-api,jakerenzella/doubtfire-api,doubtfire-lms/doubtfire-api,jakerenzella/doubtfire-api,alexcu/doubtfire-api,doubtfire-lms/doubtfire-api,final-year-project/doubtfire-api,alexcu/doubtfire-api,alexcu/doubtfire-api,doubtfire-lms/doubtfire-api,jakerenzella/doubtfire-api,jakerenzella/doubtfire-api,jakerenzella/doubtfire-api,doubtfire-lms/doubtfire-api,final-year-project/doubtfire-api,alexcu/doubtfire-api