I've added theses two definitions to xtools/xlib/stdlib.js (not yet on sourceforge):
Stdlib.PRESETS_FOLDER =
new Folder(app.path + '/' +
localize("$$$/ApplicationPresetsFolder/Presets=Presets"));
Stdlib.SCRIPTS_FOLDER =
new Folder(app.path + '/' +
localize("$$$/ScriptingSupport/InstalledScripts=Presets/Scripts"));
The give you the localized folder names for these two folders so that you can more easily find them in non-English versions of PS.
-X