Fix chooser blocks in StructBlock not overrideable

wagtail_localize/views/edit_translation.py

@@ -309,7 +309,7 @@ def widget_from_field(field):
 
         return {"type": "unknown"}
 
-    def widget_from_block(block):
+    def widget_from_block(block, block_field_name=None):
         if isinstance(block, blocks.PageChooserBlock):
             return {
                 "type": "page_chooser",
@@ -359,6 +359,8 @@ def widget_from_block(block):
             return {
                 "type": "text",
             }
+        elif isinstance(block, blocks.StructBlock):
+            return widget_from_block(block.child_blocks.get(block_field_name))
 
         return {"type": "unknown"}
 
@@ -371,6 +373,7 @@ def widget_from_block(block):
             block_field = block_type.child_blocks[block_field_name].label
         else:
             block_field = None
+            block_field_name = None
 
         return {
             "tab": tab,
@@ -379,7 +382,9 @@ def widget_from_block(block):
             "blockId": content_path_components[1],
             "fieldHelpText": "",
             "subField": block_field,
-            "widget": widget_from_block(block_type) if widget else None,
+            "widget": widget_from_block(block_type, block_field_name)
+            if widget
+            else None,
         }
 
     elif (