add design note for i18n of info text

designs/node-info-i18n.md

@@ -0,0 +1,48 @@
+---
+state: draft
+---
+
+# i18n of Node Info
+
+Current Node-RED editor allow nodes or flows has their own description written in markdown.
+
+Nodes can have internationalized info help text but markdown descriptions are restricted to one language.
+
+This proposal covers how node info (shown on the right pane of Node-RED side bar) can be internationalized. 
+
+The interface for specifying locale should follow design for locale selection interface for subflow enhancements.
+
+### Authors
+
+ - @HiroyasuNishiyamann
+
+### Details
+
+#### Interface
+
+Current locale for info text can be selected by menu at the bottom of description tab of a node.
+
+![Info Text Editor](images/i18n-info-text.png)
+
+#### Internal Representation
+
+In order to keep compatibility with old flow format, `info` property of nodes hold info text for `en-US` locale.
+
+Info texts for other locales are stored in `i18nInfo` property.  The `i18nInfo` property points to an object with `locale` as a key and corresponding text as a value.
+
+```json
+{
+    "info": "Info text in English",
+    "i18nInfo": {
+        "ja": "Info text in Japanese",
+        "de": "Info text in German"
+    }
+}
+```
+
+
+
+
+## History
+
+  - 2019-08-28 - initial revision