You can use the Powershell command below with elevated right to determine the initial install language of a Windows installation Tested with Windows 10 and 11
Tag: Language
Change Chrome Spell Check Language to UK
Within Chrome select settings from the menu, scroll down to advanced settings. Click the ‘Language and input settings’ button. Although English maybe listed it is not used for spellcheck. Click Add and select English, United Kingdom. Select the new entry and click ‘Use this language for spell checking’ Restart Chrome.