doc updates

INSTALL.txt

 I2P source installation instructions
 
+Prerequisites to build from source:
+	Java SDK (preferably Sun) 1.5.0 or higher (1.6 recommended)
+	Apache Ant 1.7.0 or higher
+	Optional, For multilanguage support: The xgettext, msgfmt, and msgmerge tools installed
+	from the GNU gettext package http://www.gnu.org/software/gettext/
+
 To build and install I2P from source, you must first build
 and package up the appropriate installer by running:
 
   ant pkg
 
+
 This will produce a few key files:
 * install.jar:    the GUI and console installer
 * i2pinstall.exe: the GUI and console installer wrapped for cross-platform execution
@@ -18,9 +25,6 @@ Or run the GUI installer:
 
 Or move the update file into an existing installation directory and restart.
 
-You will need to have ant installed from http://ant.apache.org/
-(1.7.0 or newer)
-
 Supported JVMs:
   Windows: Latest available from http://java.sun.com/ (1.5+ supported)
   Linux:   Latest available from http://java.sun.com/ (1.5+ supported)

README.txt

 Prerequisites to build from source:
 	Java SDK (preferably Sun) 1.5.0 or higher (1.6 recommended)
 	Apache Ant 1.7.0 or higher
+	Optional, For multilanguage support: The xgettext, msgfmt, and msgmerge tools installed
+	from the GNU gettext package http://www.gnu.org/software/gettext/
 
 To build:
 	ant pkg
 	Run 'ant' with no arguments to see other build options.
-	See http://www.i2p2.de/download.html for installation instructions.
+	See INSTALL.txt or http://www.i2p2.de/download.html for installation instructions.
 
 Documentation:
 	http://www.i2p2.de/