Make the supported locales initialization thread-safe

freemarker.core.InvalidReferenceException: Expression lang is undefined on line 2, column 23 in dynamic-translations.ftl.
	at freemarker.core.TemplateObject.assertNonNull(TemplateObject.java:124)
	at freemarker.core.TemplateObject.invalidTypeException(TemplateObject.java:134)
	at freemarker.core.Dot._getAsTemplateModel(Dot.java:78)
	at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
	at freemarker.core.Expression.getStringValue(Expression.java:93)
	at freemarker.core.DollarVariable.accept(DollarVariable.java:76)
	at freemarker.core.Environment.visit(Environment.java:208)
	at freemarker.core.MixedContent.accept(MixedContent.java:92)
	at freemarker.core.Environment.visit(Environment.java:208)
	at freemarker.core.IteratorBlock$Context.runLoop(IteratorBlock.java:179)
	at freemarker.core.Environment.visit(Environment.java:415)
	at freemarker.core.IteratorBlock.accept(IteratorBlock.java:102)
	at freemarker.core.Environment.visit(Environment.java:208)
	at freemarker.core.MixedContent.accept(MixedContent.java:92)
	at freemarker.core.Environment.visit(Environment.java:208)
	at freemarker.core.Environment.include(Environment.java:1477)
	at freemarker.core.Include.accept(Include.java:169)
	at freemarker.core.Environment.visit(Environment.java:208)
	at freemarker.core.MixedContent.accept(MixedContent.java:92)
	at freemarker.core.Environment.visit(Environment.java:208)
	at freemarker.core.Environment.process(Environment.java:188)
	at org.nuxeo.ecm.platform.rendering.fm.FreemarkerEngine.render(FreemarkerEngine.java:183)
	at org.nuxeo.opensocial.webengine.gadgets.render.GadgetSpecView.render(GadgetSpecView.java:187)
	at org.nuxeo.opensocial.webengine.gadgets.GadgetResource.getGadgetFile(GadgetResource.java:63)
	...
2011-09-29 03:24:30,752 ERROR [freemarker.runtime] 
Expression lang is undefined on line 2, column 23 in dynamic-translations.ftl.
The problematic instruction:
----------
==> ${lang.language} [on line 2, column 21 in dynamic-translations.ftl]
 in include "dynamic-translations.ftl" [on line 11, column 5 in gadget://userworkspaces]
----------