Indicate if setting has a language-specific value

[joyceerhl]

Testing #145588

Introduce an indicator when a setting has language specific value when viewing that setting in non-language specific scope.

For example

1. Filter to @lang:css
2. Change a setting
3. Remove filter
4. Search for that setting
5. There's no indication that the setting's value has changed for the current scope ('User') and also there is a language overriding this value.

Also same if the setting has a different value for other languages contributed in defaults

[rzhao271]

The lack of a modified filter is intentional, but imo there should at least be text saying that the setting has been overridden for some languages.
Adding to next milestone.