Update webhook to add locale to DB

[IzzySmillie]

• Story: https://github.com/RaspberryPiFoundation/digital-editor/issues/75
• Demo repo: https://github.com/raspberrypilearning/editor-content-process-demo

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• Untangle the check on the path /en so that it works for all languages
• Update to pass the lang through to the DB

Other helpful links:
Upload job: https://github.com/RaspberryPiFoundation/editor-api/blob/a0645c751ceb2c50f11278ff9e4e0207a7e66079/app/jobs/upload_job.rb

Project importer: https://github.com/RaspberryPiFoundation/editor-api/blob/30faf66ab271765666f75cf47b821ea4674958af/lib/project_importer.rb

Readme: https://github.com/RaspberryPiFoundation/editor-api/blob/main/lib/tasks/README.md

[create-issue-branch]

Branch issues/141-Update_webhook_to_add_locale_to_DB created!