Webhook content should not be localized

Summary

For issue webhooks, the content of the webhook (the representation of the issue) will be localized according to the language preference of the user who created or updated the issue. As webhook consumers may not use the same language, it makes more sense to always send webhooks in the system language.

Steps to reproduce

1. Create a new issue updated webhook
2. Change your user language preference to a non-English language like Spanish or German
3. Update an issue
4. Observe the webhook that is sent. Notice that the issue type names, descriptions, and possibly resolution values are localized.