Fonts are usually all gathered in both Fonts.xml and FontStyles.xml in both FrameXML and SharedXML folders.
FrameXML/Fonts.xml
FrameXML/FontStyles.xml
SharedXML/SharedFonts.xml
SharedXML/SharedFontStyles.xml
Templates are harder to find. They're littered all over in various XML files. Most of the generic ones would be in files that have
Template in the name (usually at the end).
Note: You need to extract
code, not
art, to extract the UI source.