maven.log

[INFO] --- merge-properties-maven-plugin:1.0:merge (merge) @ i18n ---
[INFO] Found propertyFileName without prefix checking, including... [src/main/resources/l10n/Global_en.properties]
[INFO] Found propertyFileName without prefix checking, including... [src/main/resources/l10n/Global_fr.properties]
[INFO] => Final file language.properties [en] contains 10624 entries
[INFO] => Final file language.properties [fr] contains 10647 entries
[INFO] Found propertyFileName without prefix checking, including... [src/main/resources/help/Global_en.properties]
[INFO] Found propertyFileName without prefix checking, including... [src/main/resources/help/Global_fr.properties]
[INFO] => Final file help.properties [en] contains 371 entries
[INFO] => Final file help.properties [fr] contains 376 entries

pom.xml

<plugin>
    <groupId>com.code-troopers</groupId>
    <artifactId>merge-properties-maven-plugin</artifactId>
    <version>1.0</version>
    <executions>
        <execution>
            <id>merge</id>
            <phase>generate-resources</phase>
            <goals>
                <goal>merge</goal>
            </goals>
            <configuration>
                <merges>
                    <merge>
                        <target>language.properties</target>
                        <pattern>src/main/resources/l10n/*.properties</pattern>
                        <excludeKeyCheck>
                            <excludeKeyCheck>Global</excludeKeyCheck>
                        </excludeKeyCheck>
                        <failOnCountMismatch>${merge.failOnMismatch}</failOnCountMismatch>
                    </merge>
                    <merge>
                        <target>help.properties</target>
                        <pattern>src/main/resources/help/*.properties</pattern>
                        <failOnCountMismatch>${merge.failOnMismatch}</failOnCountMismatch>
                    </merge>
                </merges>
            </configuration>
        </execution>
    </executions>
</plugin>