Fix typo in en.json

[claell]

Just a quick fix that hopefully makes it easier to ship, instead of reporting it through the customer support or other places.

[vercel[bot]]

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[claell]

("centre" is British English, so not entirely wrong. I think, "center" in American English is the preferred way, here, though.)

[CandelR]

Hey @claell , thanks for the input. I am closing this PR as it is more of a preference problem than a bug