Console, i2psnark standalone: Fix UI configuration of Argentinan Spanish

Add partial Danish translation for i2psnark
Enable zh_TW UI configuration for i2psnark standalone

apps/routerconsole/java/src/net/i2p/router/web/helpers/ConfigUIHelper.java

@@ -139,7 +139,7 @@ public class ConfigUIHelper extends HelperBase {
         { "de", "de", "Deutsch", null },
         { "et", "ee", "Eesti", null },
         { "es", "es", "Español", null },
-        { "es", "ar", "Español" ,"Argentina" },
+        { "es_AR", "ar", "Español" ,"Argentina" },
         { "fa", "ir", "Persian فارسی", null },
         { "fr", "fr", "Français", null },
         { "gl", "lang_gl", "Galego", null },