Use common CI test target via Travis

.travis.yml

@@ -5,11 +5,6 @@ before_install:
 install:
 - npm ci
 script:
-- make validate-no-uncommitted-package-lock-changes
-- npm run i18n_extract
-- npm run lint -- --max-warnings 0
-- npm run test
-- npm run build
-- npm run is-es5
+- make validate
 after_success:
 - codecov