UI i18n and the Japanese text catalog.

Wrapped the every string literals with _(...) function.
The _() function resides in "app/src/processing/app/I18n.java",
which translates the UI texts using "Resources_XX.properties" file
where XX is the locale code.

I provided the properties file for the ja (Japanese) locale.
I created this file using "xgettext" and "msgcat" commands.
"i18n_update.{py,sh}" files are the tool I used to do that.

Change in "app/build.xml" is to include the properties files
in jar file.

Author: Shigeru KANEMOTO

app/build.xml

@@ -45,6 +45,9 @@
 	   includeAntRuntime="false"
 	   debug="true"
 	   classpath="../core/core.jar; ${env.JAVA_HOME}/lib/tools.jar; lib/ant.jar; lib/ant-launcher.jar; lib/apple.jar; lib/ecj.jar; lib/jna.jar; lib/RXTXcomm.jar" />
+    <copy todir="bin" overwrite="true" verbose="true">
+      <fileset dir="src" includes="**/*.properties" />
+    </copy>
   </target>
 
   <target name="build" depends="compile" description="Build PDE">