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/build.sh

@@ -14,12 +14,20 @@ source ../ci/rust-version.sh
 ../ci/docker-run.sh "$rust_stable_docker_image" docs/convert-ascii-to-svg.sh
 ./set-solana-release-tag.sh
 
+# Get current channel
+eval "$(../ci/channel-info.sh)"
+
+# Synchronize translations with Crowdin only on stable channel
+if [ "$CHANNEL" = stable ]; then
+  echo "Downloading & updating translations..."
+  npm run crowdin:download
+  npm run crowdin:upload
+fi
+
 # Build from /src into /build
 npm run build
 echo $?
 
-eval "$(../ci/channel-info.sh)"
-
 # Publish only from merge commits and beta release tags
 if [[ -n $CI ]]; then
   if [[ -z $CI_PULL_REQUEST ]]; then