Add Internationalization and Localization

nip-xxx.md

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+NIP-XXX
+======
+
+Internationalization & Localization
+-----------------------------------
+
+`draft` `optional`
+
+## Abstract
+
+Internationalization and Localization enhances Nostr's adaptability across varied linguistic and cultural landscapes.
+By incorporating a `language` tag specifically designed for internationalization & localization within each note, 
+Nostr improves its functionality in terms of `search` or `translation` capabilities and even beyond.
+
+## `language` tag field 
+
+A new language tag field is optional, but if not specified it will categorized as `en` (Using two letter ISO 639-1 language code).
+
+```json
+{
+  "tags": [
+    ["language", 'en']
+  ]
+}
+```
+This addition not only facilitates the categorization of notes by language but also enables users to subscribe to content exclusively in their preferred language. 
+This broadens Nostr's accessibility and relevance to a global audience, ensuring that Nostr users can engage with content that resonates with their linguistic and cultural preferences.
+
+
+## Possible Extensions
+
+A Nostr Profile MAY support these extensions:
+- `allowed_language: ['en', 'jp']` - This tells a clients which language they prefer.
+- `language: 'fr'` - This tells this profile "speaks" in which language.