split upload into verbs and nouns

[timse201]

Upload can be used as a noun or verb. Currently we have only 1 string to translate. It should be split up. We did it in the past and marked them as buttons, verbs and nouns etc.

props go to @wpgerd for the report

Trac ticket: https://core.trac.wordpress.org/ticket/62732#ticket

[github-actions]

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[github-actions]

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[talldan]

Thanks for the contribution @timse201.

This looks good to me. There were some missing imports for the _x function but I've added a commit for those.

It should be ready to merge when all the automated tests pass.

[timse201]

Thank you