Add preferred_language to lead generation for registration
What does this MR do and why?
Add preferred_language to lead generation for registration
- translate the language to a shortened format, see https://gitlab.com/gitlab-org/gitlab/-/issues/424946#note_1607384072
- needed for iterable and other lead concerns
- CustomersDot support in https://gitlab.com/gitlab-org/customers-gitlab-com/-/merge_requests/8434
MR acceptance checklist
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Related to #424946
Edited by Doug Stull