[CONFIG] Can't figure out

[ExpectedIdentifier]

If the name of the lang file is base_english.lang

Then it should be:
DefaultBaseLanguage = "SnowyDeath/config/base_english.lang"

I can't see why that wouldn't work..
What's the error you get when you put both files with the same name in the folder?

EDIT:
Think I've found it!
In your language file there's this:
GameLanguageFolder = "SnowyDeath/config/lang_SnowyDeath/"

From that it looks like you'd need:
DefaultBaseLanguage = "SnowyDeath/config/SnowyDeath_base_english.lang"
DefaultGameLanguage = "SnowyDeath/config/lang_SnowyDeath/english.lang"