How to Copy Region and Language Settings to Welcome Screen and New User Accounts in Windows 10
After Windows is installed, its main language is the language of the install media used. If no additional language packs will be installed, the main language remains unchanged.
When additional language packs are installed and display languages applied to various user accounts, any of these new additional languages can be used as Windows main language. This tutorial will show you how to change the main language of Windows, the language used in Welcome, Sign In, Sign Out, Shutdown and Restart screens, Start Menu section tiles, user and power options menus and for the built-in administrator account.
Notice that for the purpose of this tutorial at least one additional language pack must be installed, and at least one user account must be using other display language than the default install language. If the computer only has one user account its display language must have been changed.
Change in Windows 10
1. Open Region Settings:
Open the Control Panel > Region (Control Panel in icon view) or Control Panel > Clock, Language and Region > Change date, time or number formats (Control Panel in category view), select the Administrative tab, click Copy Settings:
2. Copy Settings dialog explained:
In screenshot below, yellow highlight shows the language and location settings for the current user, red for system language (Welcome, Sign In, Sign Out, Shutdown, Start Menu section titles and so on), and green the settings for each new user account which will be created.
Numbered (#1) box shows the available settings. Welcome screen and system accounts, when selected and applied, changes the global Windows main language overriding the defaults with current user's settings. New user accounts, when selected and applied, changes the default language and location settings for each future user account to those of the current user.
3. Change settings:
First a screenshot from my Finnish user account's settings, the color and number codes the same as in previous screenshot:If I now want to change the Windows system globally "as Finnish as possible", change both the system language and settings for all new user accounts, I must select both available settings (#1 in screenshot above). This will change language and new user accounts as I wanted:(Before someone asks, we write countries with upper case in Finnish but languages, days and months starting with lower case , so "suomi" = Finnish but "Suomi" = Finland.)
Clicking OK applies the changed settings, system must now be rebooted.
4.The main system language changed:
Although the Windows on this machine is an original US English version, the system has now converted to Finnish as much as possible. Screenshot below shows how the date on lock screen has changed to Finnish ("keskiviikko(na)" = (on) Wednesday, "tammikuu(ta)" = (in) January), Welcome ("Tervetuloa") after sign in and Shutting down ("Sammutetaan") and everything (almost!) else is now in Finnish.
Ask if you have any questions, post your comments in this thread.