DEV: Add translations support

.tx/config

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+[main]
+host = https://www.transifex.com
+lang_map = el_GR: el, es_ES: es, fr_FR: fr, ko_KR: ko, pt_PT: pt, sk_SK: sk, vi_VN: vi
+
+[discourse-org.pluginsubscriptionsclientyml]
+file_filter = config/locales/client.<lang>.yml
+source_file = config/locales/client.en.yml
+source_lang = en
+type = YML
+
+[discourse-org.pluginsubscriptionsserveryml]
+file_filter = config/locales/server.<lang>.yml
+source_file = config/locales/server.en.yml
+source_lang = en
+type = YML
+

Gemfile

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+group :development do
+  gem 'translations-manager', git: 'https://github.com/discourse/translations-manager.git'
+end

bin/pull_translations.rb

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+#!/usr/bin/env ruby
+
+require 'translations_manager'
+
+YML_DIRS = ['config/locales'].map { |d| File.expand_path(d) }
+YML_FILE_PREFIXES = ['client', 'server']
+
+TranslationsManager::TransifexUpdater.new(YML_DIRS, YML_FILE_PREFIXES, *ARGV).perform