Default value fallback for Settings

[Slayvin]

The settings and settings groups are a great feature, but there is a problem when you have several language, and one is empty.
Let's say I want to use Settings to allow users to enter a GoogleMap api key and they have their sites in 3 languages.

Current result :
For now you have to fill the same value for the 3 languages in order to make it work. But for such setting, it makes no sense to have it translated, since the key is the same for all languages.

Expected result
If a settings value is empty/not set for a language, it should fall back to the value of the default language.

[naffiq]

@Slayvin good point, that sounds like a small but valuable fix. Will you have time to fix this behavior or shall we assign it to somebody else?