Generate the Report

To generate the localization report, just add the following in your project's pom.xml:

<project>
  ...
  <build>
    ...
  </build>
  ...
  <reporting>
    <plugins>
      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>l10n-maven-plugin</artifactId>
        <version>1.1.0</version>
        <configuration>
          <locales>
            <locale>de</locale>
            <locale>es</locale>
            <locale>fr</locale>
            ...
          </locales>
        </configuration>
      </plugin>
    </plugins>
  </reporting>
  ...
</project>

Add a <locale> element for every localization you have.

The report will be generated when you execute the Maven site plugin, like this:

mvn site

You can refer to the generated documentation to discover the different configuration options for the report mojo.