Short list of languages that are supported by Scratch's translate extension, as listed in the English dropdown menu

scratch-translate-language-map.js

// require('scratch-translate-extension-languages').menuMap.en
[
  { code: 'am',    name: 'Amharic' },
  { code: 'ar',    name: 'Arabic' },
  { code: 'az',    name: 'Azerbaijani' },
  { code: 'eu',    name: 'Basque' },
  { code: 'bg',    name: 'Bulgarian' },
  { code: 'ca',    name: 'Catalan' },
  { code: 'zh-cn', name: 'Chinese (Simplified)' },
  { code: 'zh-tw', name: 'Chinese (Traditional)' },
  { code: 'hr',    name: 'Croatian' },
  { code: 'cs',    name: 'Czech' },
  { code: 'da',    name: 'Danish' },
  { code: 'nl',    name: 'Dutch' },
  { code: 'en',    name: 'English' },
  { code: 'et',    name: 'Estonian' },
  { code: 'fi',    name: 'Finnish' },
  { code: 'fr',    name: 'French' },
  { code: 'gl',    name: 'Galician' },
  { code: 'de',    name: 'German' },
  { code: 'el',    name: 'Greek' },
  { code: 'he',    name: 'Hebrew' },
  { code: 'hu',    name: 'Hungarian' },
  { code: 'is',    name: 'Icelandic' },
  { code: 'id',    name: 'Indonesian' },
  { code: 'ga',    name: 'Irish' },
  { code: 'it',    name: 'Italian' },
  { code: 'ja',    name: 'Japanese' },
  { code: 'ko',    name: 'Korean' },
  { code: 'lv',    name: 'Latvian' },
  { code: 'lt',    name: 'Lithuanian' },
  { code: 'mi',    name: 'Maori' },
  { code: 'nb',    name: 'Norwegian' },
  { code: 'fa',    name: 'Persian' },
  { code: 'pl',    name: 'Polish' },
  { code: 'pt',    name: 'Portuguese' },
  { code: 'ro',    name: 'Romanian' },
  { code: 'ru',    name: 'Russian' },
  { code: 'gd',    name: 'Scots Gaelic' },
  { code: 'sr',    name: 'Serbian' },
  { code: 'sk',    name: 'Slovak' },
  { code: 'sl',    name: 'Slovenian' },
  { code: 'es',    name: 'Spanish' },
  { code: 'sv',    name: 'Swedish' },
  { code: 'th',    name: 'Thai' },
  { code: 'tr',    name: 'Turkish' },
  { code: 'uk',    name: 'Ukrainian' },
  { code: 'vi',    name: 'Vietnamese' },
  { code: 'cy',    name: 'Welsh' },
  { code: 'zu',    name: 'Zulu' }
]