Addressed nits.

common/lib/xmodule/xmodule/library_content_module.py

@@ -361,7 +361,7 @@ class LibraryContentDescriptor(LibraryContentFields, MakoModuleDescriptor, XmlDe
                         # See https://openedx.atlassian.net/browse/TNL-993
                         action_class='library-update-btn',
                         # Translators: ↻ is an UTF icon symbol, no need translating it.
-                        action_label=_(u"↻ Update now.")
+                        action_label=_(u"{0} Update now.").format(u"↻")
                     )
                 )
                 return False
@@ -453,8 +453,8 @@ class LibraryContentDescriptor(LibraryContentFields, MakoModuleDescriptor, XmlDe
         If source_libraries has been edited, refresh_children automatically.
         """
         old_source_libraries = LibraryList().from_json(old_metadata.get('source_libraries', []))
-        if set(old_source_libraries) != set(self.source_libraries) or \
-                old_metadata.get('capa_type', ANY_CAPA_TYPE_VALUE) != self.capa_type:
+        if (set(old_source_libraries) != set(self.source_libraries) or
+                old_metadata.get('capa_type', ANY_CAPA_TYPE_VALUE) != self.capa_type):
             try:
                 self.refresh_children(None, None, update_db=False)  # update_db=False since update_item() is about to be called anyways
             except ValueError:

common/lib/xmodule/xmodule/library_tools.py

@@ -64,7 +64,7 @@ class LibraryToolsService(object):
         Returns generator containing (child_key, child) for all children matching filter criteria
         """
         children = (
-            (child_key, self.store.get_item(child_key, depth=9))
+            (child_key, self.store.get_item(child_key, depth=None))
             for child_key in from_block.children
         )
         return (