fix failing tests and fix deprication warnings

.babelrc.json

app/components/tag/item.hbs

app/components/tag/item.js

app/components/tag/table_row.js

config/environment.js

mirage/config.js

mirage/scenarios/default.js

mirage/serializers/application.js

package-lock.json

package.json

tests/acceptance/.gitkeep

tests/acceptance/roles-test.js

tests/acceptance/tags-test.js