Fully change language (including Culture) for the current PowerShell session

Question

My Win 10 system has Spanish language. I mean to fully operate a PowerShell session in English. Across everything I tried (see below), I managed to change the UICultur

Answer 1

The following function will change both Culture and UICulture for the current PowerShell session in PowerShell 5.1:

function Set-PowerShellLanguage {
    
    Param (
        [Parameter(Mandatory)] 
        [System.Globalization.CultureInfo] $CultureInfo
    )

    if ($CultureInfo -notin (Get-WinUserLanguageList | % {$_.LanguageTag})) {
        Write-Error "Language pack for $CultureInfo is not installed."
        return
    }
    [System.Reflection.Assembly]::Load('System.Management.Automation').GetType('Microsoft.PowerShell.NativeCultureResolver').GetField('m_Culture', 'NonPublic, Static').SetValue($null, $CultureInfo)
    [System.Reflection.Assembly]::Load('System.Management.Automation').GetType('Microsoft.PowerShell.NativeCultureResolver').GetField('m_uiCulture', 'NonPublic, Static').SetValue($null, $CultureInfo)
}

It is actually a merge of the already linked answer and mkelement0's comment.

Example usage:

PS C:\> Get-Culture

LCID             Name             DisplayName
----             ----             -----------
1033             en-US            English (United States)


PS C:\> Get-UICulture

LCID             Name             DisplayName
----             ----             -----------
1033             en-US            English (United States)


PS C:\> Set-PowerShellLanguage 'es-AR'
PS C:\> Get-Culture

LCID             Name             DisplayName
----             ----             -----------
11274            es-AR            Spanish (Argentina)


PS C:\> Get-UICulture

LCID             Name             DisplayName
----             ----             -----------
11274            es-AR            Spanish (Argentina)


PS C:\>