After I completed a recent upgrade of Windows 10 to 1803, I noticed that my English (United Kingdom) language had been joined by English (United States) and that I couldn’t remove this from the system.
After a bit of research I came across the following article that demonstrated how the additional language can be removed using PowerShell – https://answers.microsoft.com/en-us/windows/forum/windows_10-other_settings/unable-to-remove-a-language-from-windows-10-april/47c13ea5-79ed-4a29-96d4-47d1264b6838
$LangList = Get-WinUserLanguageList
$MarkedLang = $LangList | where LanguageTag -eq "en-US"
Set-WinUserLanguageList $LangList -Force
Nice and cleanly I no longer have the “ENG” menu in my task bar to switch to a language I don’t need.