[i18n] Add /i18n endpoint to provide all custom node translations (#6558)

* [i18n] Add /i18n endpoint to provide all custom node translations

* Sort glob result for deterministic ordering

* Update comment

utils/json_util.py

@@ -0,0 +1,26 @@
+def merge_json_recursive(base, update):
+    """Recursively merge two JSON-like objects.
+    - Dictionaries are merged recursively
+    - Lists are concatenated
+    - Other types are overwritten by the update value
+
+    Args:
+        base: Base JSON-like object
+        update: Update JSON-like object to merge into base
+
+    Returns:
+        Merged JSON-like object
+    """
+    if not isinstance(base, dict) or not isinstance(update, dict):
+        if isinstance(base, list) and isinstance(update, list):
+            return base + update
+        return update
+
+    merged = base.copy()
+    for key, value in update.items():
+        if key in merged:
+            merged[key] = merge_json_recursive(merged[key], value)
+        else:
+            merged[key] = value
+
+    return merged