How to reload page when a button is clicked?

You can use render attribute of a4j:commandButton for this purpose. Example:

<a4j:commandButton value="buttonName"
    action="#{bean.action}"
    render="someForm" />

In your code change render="@none" to render="@form" or render="@all".

You can use javascript

location.reload();

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Or you can redirect to same URI as in this answer.

First change commandButton to call bean method:

onConfirmComplete="#{messagesListBean.reload}"

And in the bean:

public void reload() throws IOException {
    ExternalContext ec = FacesContext.getCurrentInstance().getExternalContext();
    ec.redirect(((HttpServletRequest) ec.getRequest()).getRequestURI());
}