Nublette Requires Assistance with Scripting and Puzzles

[CarnivorousJelly]

I'm getting better at scripting... I think. But there is one thing that's still really troubling me:
This extra_english.lang file that keeps being referenced in all the tutorials, is there a tutorial on how to create one and where to place it? I have one started:

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<LANGUAGE>
  <RESOURCES>
    <Directory Path="fonts/eng" />
    <Directory Path="lang/eng" />
  <CATEGORY Name="Inventory">
    <Entry Name="LibraryKey">Spare Library Key</Entry>
    <Entry Name="ItemDesc_LibraryKey">Lillian's secret key for the library.</Entry>
  </CATEGORY>
//// It continues for a while with several more categories ////
</RESOURCES>
</LANGUAGE>

Problem is, I'm not sure where to put it (in with the english.lang file?) or how to ensure my cs references this file instead of the one from the original game.

Oh, and while I'm asking questions,

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void FadeInSound(string& asSoundName, float afFadeTime, bool abPlayStart);

what does "bool" mean and what does it do?