feat(walburga): Add i18n named export

designs/walburga/i18n/en.json

@@ -2,6 +2,7 @@
   "t": "Walburga Wappenrock",
   "d": "Walburga is a tabard/surcoat, a historical garment from medieval Europe",
   "p": {
+    "base": "Base",
     "back": "Back",
     "front": "Front"
   },

designs/walburga/src/index.mjs

@@ -1,5 +1,6 @@
 import { Design } from '@freesewing/core'
 import { data } from '../data.mjs'
+import { i18n } from '../i18n/index.mjs'
 import { front } from './front.mjs'
 import { back } from './back.mjs'
 // Re-export skeleton parts so peope can re-use them
@@ -12,4 +13,4 @@ const Walburga = new Design({
 })
 
 // Named exports
-export { back, front, base, Walburga }
+export { back, front, base, Walburga, i18n }