Extract list of supported languages in separate file

Signed-off-by: Erik Michelson <github@erik.michelson.eu>

app.js

@@ -28,6 +28,8 @@ const models = require('./lib/models')
 const csp = require('./lib/csp')
 const metrics = require('./lib/prometheus')
 
+const supportedLocalesList = Object.keys(require('./locales/_supported.json'))
+
 // server setup
 const app = express()
 let server = null
@@ -126,8 +128,7 @@ if (config.csp.enable) {
 }
 
 i18n.configure({
-  locales: ['en', 'zh-CN', 'zh-TW', 'fr', 'de', 'ja', 'es', 'ca', 'el', 'pt', 'it', 'tr', 'ru', 'nl', 'hr', 'pl',
-    'uk', 'hi', 'sv', 'eo', 'da', 'ko', 'id', 'sr', 'vi', 'ar', 'cs', 'sk', 'ml', 'bg', 'fa', 'gl', 'he', 'hu', 'oc', 'pt-br'],
+  locales: supportedLocalesList,
   cookie: 'locale',
   indent: '    ', // this is the style poeditor.com exports it, this creates less churn
   directory: path.join(__dirname, '/locales'),