How to know what language is on

I am trying to test something by testing in what language is current page with following:
public boolean getEnglishVersionOfDescription() {
if ("en".equalsIgnoreCase(persistentLocale.get().getLanguage())) {
return true;
} else {
return false;

tml
<t:loop source="propositioning" value="proposition">
<t:if test="EnglishVersionOfDescription">
${proposition.getEnglishProposition}
</t:if>

my proposition is pulled from db with following
public List getPropositioning() {
List l;
l = session.createCriteria(Proposition.class).add(Restrictions.eq("article.id", this.getId())).
list();
return l;

However I keep getting Render queue error in BeginRender[Testing:if]: Failure reading
parameter 'test' of component Testing:if:
org.apache.tapestry5.ioc.internal.util.TapestryException and I have no clue what is it complaining about?