adding swahili translations for the error messages
adding swahili translations for the error messages

caktus/rapidsms-decisiontree-app,caktus/rapidsms-decisiontree-app,caktus/rapidsms-decisiontree-app,eHealthAfrica/rapidsms-decisiontree-app,ehealthafrica-ci/rapidsms-decisiontree-app,eHealthAfrica/rapidsms-decisiontree-app,ehealthafrica-ci/rapidsms-decisiontree-app