DataCite Xml updates- 4.7, language, Translator, Keyword URI

[qqmyers]

What this PR does / why we need it: This PR updates the citation block contributor types to add 'Translator' and makes a few small updates to the DataCite XML export/xml metadata sent to DataCite:

• updates the schema compliance to version 4.7
• adds 'Translator' as an allowed contributor type (Dataverse has a 'Translator' option but in DataCite 4.5, 'Translator' is not allowed and the xml mapped it to 'Other' instead)
• adds a language element for the case where the dataset has one citation metadatablock: language defined. In other cases, the language element is not included (as before).
• adds the value of any keywordTermURI value as the valueURI attribute in the resulting element

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[jggautier]

adds 'Translator' as an allowed contributor type (Dataverse has a 'Translator' option but in DataCite 4.5, 'Translator' is not allowed and the xml mapped it to 'Other' instead)

Could you write more about how Dataverse has a 'Translator' option? Or how do we expect someone depositing a dataset in a Dataverse repository to indicate that someone contributed as a translator? I ask because I don't see "Translator" in the deposit form's Contributor Type dropdown on Demo Dataverse or in the list of contributor types in the citation.tsv and citation.properties file that ships with Dataverse.

I do see it in the citation metadata block that QDR is using, at https://data.qdr.syr.edu/api/metadatablocks/citation.

Do you know yet if you're planning to merge this PR for the 6.11 release?

I ask because in #12281 we're tracking other changes we're planning to make to the information that Dataverse includes in the DataCite XML export. That GitHub issue has a milestone label for 6.11, although we're not sure yet if we'll be able to finish it for the 6.11 release.

[qqmyers]

Since Translator wasn't yet in the citation block, I've added it in the PR. When/if this gets merged is not my call. (As QDR is already deploying these changes, the priority should be based on whether Harvard or other GDCC members want it.)