to add localizations in a theme, add this compile section your your build.xml and the languages in the usual location

build.xml

<?xml version="1.0"?>
<!DOCTYPE project>

<project name="sevencogs-theme" basedir="." default="deploy">
	<import file="../build-common-theme.xml" />

	<property name="theme.parent" value="_styled" />

	<target name="compile">
		<mkdir dir="docroot/WEB-INF/classes"/>

		<copy todir="docroot/WEB-INF/classes">
			<fileset dir="docroot/WEB-INF/src"  />
		</copy>

		<antcall target="build-common-theme.compile" />
	</target>
</project>