feat: docs i18n support (continuation from #14818) (#17190)

* Initial commit for i18n support

* Bring out index page

* Lint
	modified:   src/pages/index.js

* More Crowdin ephemera

* copy src content to i18n/**/docusaurus-plugin-content-docs/current folders

* run write-translations

* remove superflous files in i18n

* fix formatting

* remove icons folders from translations, add ja, pt, vi translations

* fix formatting

* update translation JSON files

* add crowdin support & crowdin:sync command, sync with crowdin

* exclude failing locales

* remove i18n from git cache, add write-heading-ids script

* add crowdin:sync to before_install.sh script

* add write-i18m shortening script & crowdin:download script (also to before_install.sh)

* move crowdin:download from before_install.sh to prebuild hook

* remove prebuild hook

* remove crowdin script, bump deps

* re-add cli/usage

* update package-lock.json

* add translation sync to build.sh for master

* update README

* add ja to localesNotBuilding, write e-ids

* fix formatting

* get on sync with master

* replace check for master branch

* change build script to work on travis

* use refs instead of names

* fix build.sh

* replace head ref check with channel check

* get stable channel in build.sh

* remove zip

* remove header ids

Co-authored-by: rmshea <8948187+rmshea@users.noreply.github.com>

docs/docusaurus.config.js

@@ -20,8 +20,29 @@ module.exports = {
     },
   ],
   i18n: {
-    defaultLocale: 'en',
-    locales: ['en', 'zh'],
+    defaultLocale: "en",
+    locales: ["en", "de", "es", "ru", "ar"],
+    // localesNotBuilding: ["ko", "pt", "vi", "zh", "ja"],
+    localeConfigs: {
+      en: {
+        label: "English",
+      },
+      ru: {
+        label: "Русский",
+      },
+      es: {
+        label: "Español",
+      },
+      de: {
+        label: "Deutsch",
+      },
+      ar: {
+        label: "العربية",
+      },
+      ko: {
+        label: "한국어",
+      },
+    },
   },
   themeConfig: {
     navbar: {
@@ -57,8 +78,8 @@ module.exports = {
           position: "left",
         },
         {
-          type: 'localeDropdown',
-          position: 'right',
+          type: "localeDropdown",
+          position: "right",
         },
         {
           href: "https://discordapp.com/invite/pquxPsq",