I18n Disambiguation: "Add" in menu labels.

This one is usually a verb/action one in menus' labels,
hence we give it the Operator default context.

Part of T43295.

release/scripts/startup/bl_ui/space_sequencer.py

@@ -19,6 +19,7 @@
 # <pep8 compliant>
 import bpy
 from bpy.types import Header, Menu, Panel
+from bpy.app.translations import contexts as i18n_contexts
 from rna_prop_ui import PropertyPanel
 from .properties_grease_pencil_common import (
     AnnotationDataPanel,
@@ -356,6 +357,7 @@ class SEQUENCER_MT_frame(Menu):
 
 class SEQUENCER_MT_add(Menu):
     bl_label = "Add"
+    bl_translation_context = i18n_contexts.operator_default
 
     def draw(self, context):