feat: add translation for zh-tw

This PR adds the zh-tw translation for Medusa Admin.

All keys in zh-tw.json have been translated.
The file has been validated locally using yarn i18n:validate, and no issues were found.

packages/admin/dashboard/src/i18n/languages.ts

@@ -1,4 +1,4 @@
-import { de, enUS, es, fr, it, ja, pl, ptBR, th, tr, uk } from "date-fns/locale"
+import { de, enUS, es, fr, it, ja, pl, ptBR, th, tr, uk, zhTW } from "date-fns/locale"
 import { Language } from "./types"
 
 export const languages: Language[] = [
@@ -68,4 +68,10 @@ export const languages: Language[] = [
     ltr: true,
     date_locale: uk,
   },
+  {
+    code: "zhTW",
+    display_name: "繁體中文",
+    ltr: true,
+    date_locale: zhTW,
+  },
 ]

packages/admin/dashboard/src/i18n/translations/index.ts

@@ -9,6 +9,7 @@ import ptBR from "./ptBR.json"
 import th from "./th.json"
 import tr from "./tr.json"
 import uk from "./uk.json"
+import zhTw from "./zh-tw.json"
 
 export default {
   de: {
@@ -44,4 +45,7 @@ export default {
   uk: {
     translation: uk,
   },
+  zhTw: {
+    translation: zhTw,
+  },
 }