ci: add sync_translations job for CircleCI

.circleci/config.yml

@@ -85,6 +85,31 @@ jobs:
       - test
       - deploy_gh_pages
       - deploy_npm
+  sync_translations:
+    <<: *defaults
+    steps:
+      - run:
+          name: Sync Translations
+          command: |
+            echo "Starting translation sync"
+            set -ev
+            git checkout develop
+            # update translations, and test any updated messages
+            npm run translate
+            npm run translate:update
+            npm run test:messages
+            # stage any changes in the msg directory
+            git add ./msg
+            if git diff --cached --exit-code --quiet; then
+              echo "Nothing to commit."
+            else
+              git commit -m 'Update translations from Transifex [skip ci]'
+              # add remote, make sure that API token doesn't end up in the log
+              git remote add origin-translation \
+                https://${GH_TOKEN}@github.com/${CIRCLE_PROJECT_USERNAME}/${CIRCLE_PROJECT_REPONAME}.git \
+                > /dev/null 2>&1
+              git push --set-upstream origin-translation develop
+            fi
 workflows:
   version: 2
   default:
@@ -93,4 +118,16 @@ workflows:
           context:
             - dockerhub-credentials
             - scratch-npm-creds
-  # TODO: another job to replace i18n/sync_translations.sh
+  sync_translations:
+    triggers:
+      - schedule:
+          cron: 0 0 * * 1 # weekly on Monday
+          filters:
+            branches:
+              only:
+                - develop
+    jobs:
+      - sync_translations:
+          context:
+            - dockerhub-credentials
+            - scratch-npm-creds