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diff --git a/base/runtime/org.argeo.eclipse.ui.rap/src/main/java/org/argeo/eclipse/ui/specific/ThreadNLS.java b/base/runtime/org.argeo.eclipse.ui.rap/src/main/java/org/argeo/eclipse/ui/specific/ThreadNLS.java
new file mode 100644
index 000000000..3bab4d999
--- /dev/null
+++ b/base/runtime/org.argeo.eclipse.ui.rap/src/main/java/org/argeo/eclipse/ui/specific/ThreadNLS.java
@@ -0,0 +1,33 @@
+package org.argeo.eclipse.ui.specific;
+
+import org.eclipse.osgi.util.NLS;
+import org.eclipse.rwt.RWT;
+
+/** NLS attached to a given thread */
+public class ThreadNLS<T extends NLS> extends InheritableThreadLocal<T> {
+	public final static String DEFAULT_BUNDLE_LOCATION = "/properties/plugin";
+
+	private final String bundleLocation;
+
+	private Class<T> type;
+	private Boolean utf8 = false;
+
+	public ThreadNLS(String bundleLocation, Class<T> type, Boolean utf8) {
+		this.bundleLocation = bundleLocation;
+		this.type = type;
+		this.utf8 = utf8;
+	}
+
+	public ThreadNLS(Class<T> type) {
+		this(DEFAULT_BUNDLE_LOCATION, type, false);
+	}
+
+	@SuppressWarnings("unchecked")
+	@Override
+	protected T initialValue() {
+		if (utf8)
+			return (T) RWT.NLS.getUTF8Encoded(bundleLocation, type);
+		else
+			return (T) RWT.NLS.getISO8859_1Encoded(bundleLocation, type);
+	}
+}