Sets the KINDOO invitation email for a given language that is sent to a user that does have the KINDOO application and is flagged as temporary. If email subject and body are set to empty for a given language, the English saved version will be used. If the English saved version is empty, the email saved by KindooSaveSiteInvitationVerifiedKindooUserEmailByLanguage endpoint will be used. If that is also empty, the default KINDOO email will be used.