Completely lost at internationalization (i18n)

I'm completely stumped on I18n. Any help would be greatly appreciated. Here's my info:

- Using mvn 3.0.5

- Using uiBinder

- GWT 2.5.1 with GWTBootstrap

- Eclipse 4.2 with maven integration

All working, except when trying to add I18n for dutch (nl, default) and english (en)

Part of .gwt.xml

<inherits name="com.google.gwt.i18n.I18N" />
<extend-property name="locale" values="nl" />
<extend-property name="locale" values="en" />
<set-property-fallback name="locale" value="en"/>
<set-property name="locale" value="nl"/>

Example part of uiBinder:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE ui:UiBinder SYSTEM "http://dl.google.com/gwt/DTD/xhtml.ent">
<ui:UiBinder xmlns:ui="urn:ui:com.google.gwt.uibinder"
xmlns:b="urn:import:com.github.gwtbootstrap.client.ui"
xmlns:g="urn:import:com.google.gwt.user.client.ui"
ui:generateFormat='com.google.gwt.i18n.rebind.format.PropertiesFormat'
ui:generateKeys="com.google.gwt.i18n.rebind.keygen.MD5KeyGenerator"
ui:generateLocales="default"
>
<b:Container>
<b:Container ui:field="signupContainer">
<b:Row>
<b:Paragraph><ui:msg description="Enter user details">Please enter your details to signup</ui:msg></b:Paragraph>
</b:Row>

Part of pom.xml:

<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>gwt-maven-plugin</artifactId>
<version>2.5.1</version>
<executions>
<execution>
<goals>
<goal>compile</goal>
<goal>i18n</goal>
<goal>generateAsync</goal>
</goals>
</execution>
</executions>
<configuration>
<i18nMessagesBundle>com.mongoasis.presentation.i18n.Messages</i18nMessagesBundle>
<runTarget>mongoasis.html</runTarget>
<draftCompile>true</draftCompile>
<optimizationLevel>1</optimizationLevel>
<extraParam>true</extraParam>
</configuration>
</plugin>

According to some documentation I should be able to generate property files using mvn install or mvn gwt:i18n. However doing that results in errors/warnings the the com.mongoasis.presentation.i18n.Messages file could not be found. So I create it manually after which it complains that it is ampty. Adding random key-value pairs stops the error message, but nowhere I find MD5 hashed properties to fill in. Event specifying the key manually does not result in the text being replaced with any translated text.

I'm felling lost and alone in a dark world... Who enlightens me? 

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