Document language-specific banner feature (#2544)

* Update components/banner.mdx

Co-Authored-By: mintlify[bot] <109931778+mintlify[bot]@users.noreply.github.com>

* Update organize/navigation.mdx

Co-Authored-By: mintlify[bot] <109931778+mintlify[bot]@users.noreply.github.com>

* Update organize/navigation.mdx

Co-Authored-By: mintlify[bot] <109931778+mintlify[bot]@users.noreply.github.com>

* Apply suggestions from code review

* Apply suggestion from @ethanpalm

* Apply suggestion from @ethanpalm

* Apply suggestion from @ethanpalm

* Apply suggestion from @ethanpalm

---------

Co-authored-by: mintlify[bot] <109931778+mintlify[bot]@users.noreply.github.com>
Co-authored-by: Ethan Palm <[email protected]>

Author: mintlify[bot]

components/banner.mdx

@@ -39,4 +39,54 @@ To add a banner, use the `banner` property in your `docs.json`:
 
 <ResponseField name="dismissible" type="boolean">
   Whether users can dismiss the banner. When `true`, users can close the banner and it won't reappear for their session. Defaults to `false`.
-</ResponseField>
+</ResponseField>
+
+## Language-specific banners
+
+Configure different banner content for each language in your documentation. Define language-specific banners in the `navigation.languages` array in your `docs.json`.
+
+```json
+{
+  "navigation": {
+    "languages": [
+      {
+        "language": "en",
+        "banner": {
+          "content": "🚀 Version 2.0 is now live! See our [changelog](/en/changelog) for details.",
+          "dismissible": true
+        },
+        "groups": [
+          {
+            "group": "Getting started",
+            "pages": ["en/overview", "en/quickstart"]
+          }
+        ]
+      },
+      {
+        "language": "es",
+        "banner": {
+          "content": "🚀 ¡La versión 2.0 ya está disponible! Consulta nuestro [registro de cambios](/es/changelog) para más detalles.",
+          "dismissible": true
+        },
+        "groups": [
+          {
+            "group": "Getting started",
+            "pages": ["es/overview", "es/quickstart"]
+          }
+        ]
+      }
+    ]
+  },
+  "banner": {
+    "content": "🚀 Version 2.0 is now live!",
+    "dismissible": true
+  }
+}
+```
+
+### Fallback behavior
+
+Banners follow a priority order when determining which content to display:
+
+1. **Language-specific banner**: If the current language has a `banner` configuration, it takes priority.
+2. **Global banner**: If no language-specific banner exists, display the global `banner`.

organize/navigation.mdx

@@ -511,7 +511,7 @@ Partition your navigation into different languages. Languages are selectable fro
   alt="Decorative graphic of a language switcher."
 />
 
-In the `navigation` object, `languages` is an array where each entry is an object that requires a `language` field and can contain any other navigation fields.
+In the `navigation` object, `languages` is an array where each entry is an object that requires a `language` field and can contain any other navigation fields, including language-specific banner configurations.
 
 We currently support the following languages for localization:
 
@@ -550,6 +550,10 @@ We currently support the following languages for localization:
     "languages": [
       {
         "language": "en",
+        "banner": {
+          "content": "🚀 Version 2.0 is now live! See our [changelog](/en/changelog) for details.",
+          "dismissible": true
+        },
         "groups": [
           {
             "group": "Getting started",
@@ -559,6 +563,10 @@ We currently support the following languages for localization:
       },
       {
         "language": "es",
+        "banner": {
+          "content": "🚀 ¡La versión 2.0 ya está disponible! Consulta nuestro [registro de cambios](/es/changelog).",
+          "dismissible": true
+        },
         "groups": [
           {
             "group": "Getting started",