Add Traditional Chinese localization. (#201)

* i18n: better formatted yaml for newline matter

* i18n: add zh-tw.yaml

assets/src/i18n/index.js

@@ -4,6 +4,7 @@ import en from './en.yaml'
 import pt from './pt.yaml'
 import ja from './ja.yaml'
 import zhCN from './zh-cn.yaml'
+import zhTW from './zh-tw.yaml'
 
 Vue.use(VueI18n)
 
@@ -15,6 +16,7 @@ const i18n = new VueI18n({
     'pt': pt,
     'ja': ja,
     'zh-cn': zhCN
+    'zh-tw': zhTW
   }
 })