Add return reasons data and category mappings

- Add 359 curated return reasons in data/return_reasons.yml (list may evolve)
- Add English localization data file for return reasons
- Map return reasons to all 26 taxonomy verticals
- 6 general return reasons + 353 product-specific reasons
- Alphabetical ordering with Unknown (ID 5) and Other (ID 6) last (IDs are placeholders)

Author: ricardotejedorsanz

data/categories/aa_apparel_accessories.yml

@@ -3,3 +3,10 @@
   name: Bundles
   children: []
   attributes: []
+  return_reasons:
+  - changed_my_mind
+  - damaged_or_defective
+  - item_not_as_described
+  - received_wrong_item
+  - unknown
+  - other