i18n: use zh-TW and zh-CN over zh-Hant and zh-Hans (#377)

Both crowdin and docsearch i18n configs use TW and CN over Hant and Hans. This should reduce some config confusions.
cc @ericnakagawa. Also, apparently you're working on algolia search i18n?

crowdin.yaml

@@ -41,8 +41,8 @@ files:
         'tr': 'tr'
         'uk': 'uk'
         'vi': 'vi'
-        'zh-CN': 'zh-Hans'
+        'zh-CN': 'zh-CN'
-        'zh-TW': 'zh-Hant'
+        'zh-TW': 'zh-TW'
   -
     source: '/website/i18n/en.json'
     translation: '/website/i18n/%locale%.json'

docs/guides-translation.md

@@ -140,8 +140,8 @@ files:
         'ko': 'ko'
         'mr': 'mr-IN'
         'pt-BR': 'pt-BR'
-        'zh-CN': 'zh-Hans'
+        'zh-CN': 'zh-CN'
-        'zh-TW': 'zh-Hant'
+        'zh-TW': 'zh-TW'
 ```
 
 You can go [here](https://support.crowdin.com/configuration-file/) to learn more about customizing your `crowdin.yaml` file.

examples/translations/crowdin.yaml

@@ -41,8 +41,8 @@ files:
         'tr': 'tr'
         'uk': 'uk'
         'vi': 'vi'
-        'zh-CN': 'zh-Hans'
+        'zh-CN': 'zh-CN'
-        'zh-TW': 'zh-Hant'
+        'zh-TW': 'zh-TW'
   -
     source: '/website/i18n/en.json'
     translation: '/website/i18n/%locale%.json'

examples/translations/languages.js

@@ -174,8 +174,8 @@ const languages = [
   {
     enabled: false,
     name: '中文',
-    tag: 'zh-Hans',
+    tag: 'zh-CN',
   },
-  {enabled: false, name: '繁體中文', tag: 'zh-Hant'},
+  {enabled: false, name: '繁體中文', tag: 'zh-TW'},
 ];
 module.exports = languages;

website/languages.js

@@ -174,12 +174,12 @@ const languages = [
   {
     enabled: false,
     name: "简体中文",
-    tag: "zh-Hans"
+    tag: "zh-CN"
   },
   {
     enabled: false,
     name: "繁體中文",
-    tag: "zh-Hant"
+    tag: "zh-TW"
   }
 ];
 module.exports = languages;