Preliminary fixes for xJournalBookGUIPopup

This begins an attempt to move game data out of the python scripts.
In this case, it allows official and fan Ages to use loc paths
directly instead of a reference to a key in xJournalBookDefs in
their PythonFileMod usage of this global script.
Merge pull request #48 from Deledrius/JournalBookFixes

Preliminary localization fixes for xJournalBookGUIPopup