I18n: make more parts of the UI translatable

- "Name collisions" label in mesh properties
- "Threshold" labels in Vertex Weight Edit modifier
- "Particle System" label in Particle Instance modifier
- Slot number in the Shader Editor

- Status bar keymap items during modal operations:
  add TIP_() macro to status bar interface template

- On dumping messages, sort preset files so their messages are stable
  between runs

Ref. T43295

Reviewed By: mont29

Differential Revision: https://developer.blender.org/D15607

release/scripts/startup/bl_ui/space_node.py

@@ -375,8 +375,8 @@ class NODE_PT_material_slots(Panel):
     def draw_header(self, context):
         ob = context.object
         self.bl_label = (
-            "Slot " + str(ob.active_material_index + 1) if ob.material_slots else
-            "Slot"
+            iface_("Slot %d") % (ob.active_material_index + 1) if ob.material_slots else
+            iface_("Slot")
         )
 
     # Duplicate part of 'EEVEE_MATERIAL_PT_context_material'.