Add translate method for FuncDecl in java api

src/api/java/FuncDecl.java

@@ -59,6 +59,24 @@ public class FuncDecl extends AST
         return Native.getFuncDeclId(getContext().nCtx(), getNativeObject());
     }
 
+    /**
+     * Translates (copies) the AST to the Context {@code ctx}.
+     * @param ctx A context
+     *
+     * @return A copy of the AST which is associated with {@code ctx}
+     * @throws Z3Exception on error
+     **/
+    public FuncDecl translate(Context ctx)
+    {
+
+        if (getContext() == ctx) {
+            return this;
+        } else {
+            return new FuncDecl(ctx, Native.translate(getContext().nCtx(),
+                getNativeObject(), ctx.nCtx()));
+        }
+    }
+
     /**
      * The arity of the function declaration
      **/