I removed the backslashes from the examples, that way it works fine in WicketMessageResolverTest#test_2().

In reply to a comment by Stijn Geukens:

The above way of putting components into the message did not work for me.
The following does:

main=I agree to the $\{terms} and am 18y
terms_text=terms and conditions

Link<Void> terms = new Link<Void>("terms") {
    public void onClick() {}
};
this.add(terms);

<wicket:message key="main">
    <a wicket:id="terms"><wicket:message key="terms_text" /></a>
</wicket:message>

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[CONF] Apache Wicket > Everything about Wicket internationalization

Everything about Wicket internationalization