add a space between 2 strings

[Presskopp]

Trac ticket: https://core.trac.wordpress.org/ticket/61506

[github-actions]

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[github-actions]

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[Presskopp]

you're right - I put the space in front of the adjacent message

[narenin]

@Presskopp It looks good to me.

[SergeyBiryukov]

Thanks for the PR! Merged in r58581 with some adjustments.