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I'm pretty sure you can play with a full English client if you so choose regardless of your realm by setting the appropriate language option from the Blizzard launcher.
Options -> Game Preferences -> (Dropdown with all language clients)
If that is not the main requirement but you prefer a "dual" language client where a second tooltip shows the alternative language,
that is a huge/huge undertaking in terms of data and I doubt it's feasible.
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