Add tasks for all the new languages

Task/Unicode-strings/Sidef/unicode-strings.sidef

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+# International class; name and street
+ class 国際( なまえ, Straße ) {
+
+    # Say who am I!
+    method 言え {
+        say "I am #{self.なまえ} from #{self.Straße}";
+    }
+}
+
+ # all the people of the world!
+ var 民族 = [
+              国際( "高田　Friederich", "台湾" ),
+              国際( "Smith Σωκράτης", "Cantù" ),
+              国際( "Stanisław Lec", "południow" ),
+            ];
+
+民族.each { |garçon|
+    garçon.言え;
+}