I18N Issue 5.9 RC1 String “Light”

The string “Light” in the following codes means different things.
wp-includes/class-wp-theme.php:985
wp-includes/js/dist/block-editor.js:22719
It means light color in class-wp-theme.php, and it means light font style in block-editor.js.
For zh_TW, the first translation is “淺色” and the second translation is “細體”.
The string “Light” current shared the same translation, it must be separated into two strings.