Windows 10 displays gibberish text in some apps

Method 1 in this link fixed my problem after creators update:

https://answers.microsoft.com/en-us/windows/forum/windows_10-other_settings/windows-10-english-system-text-show-as-gibberish/93cd572c-886e-419b-8889-531cff288223

Change Language settings through Control Panel.

• Type Control Panel into the search bar on desktop and select the same from the list.
• Click on Clock, Language, and Region.
• Click Region, then go to Administrative tab.
• Make sure that English (United States) is displayed under Current language for non-Unicode programs or as per your region. If not change it to the same. If it ask to reboot your PC, do the same.

Now check if it return back to normal language. If in case you need to make changes to the font and restore it to default, then follow with the below steps.

• Type Control Panel into the search bar on desktop and select the same from the list. Click Appearance and Personalization, and then click Fonts.

• In the left pane, click Font settings.

• Click Restore default font settings. Then restart your PC and check if it take changes.

This issue was a Windows issue and is already fixed with a Windows Update.

https://support.microsoft.com/en-us/help/4020102/windows-10-update-kb4020102

Addressed issue where some non-Unicode fonts (Courier, MS Sans Serif, etc.) do not render characters correctly on non-Latin, single-byte system locales (Greek, Hebrew, Arabic, etc.). Black bars or other artifacts appear instead.