Refer to user as 'them' rather than 'it'

[johnbillion]

We usually refer to a singular user as 'them' but on the Add New User screen in Multisite we use 'it'.

[toscho]

How can a single new user be them?

I am not a native speaker, but this looks odd.

[johnbillion]

It's a singular pronoun used when using him or her isn't relevant.

[rmccue]

Replying to toscho:

How can a single new user be them?

I am not a native speaker, but this looks odd.

More specifically: "they"/"them" is used for gender-indeterminate subjects/objects (not neuter) whereas "it" is usually used for non-gendered subjects/objects. See also ​Wikipedia.

Most style guides seem to be ambivalent on the issue, preferring to rewrite the sentence to avoid it. That said, given precedent in core, +1.

[SergeyBiryukov]

Would be consistent with the other strings in the file.

[wonderboymusic]

these are all marked 3.7-early

[ryan]

In 24992:

Bestow sentience upon users. Level up their pronoun.

Props johnbillion
fixes #24513