How to use the exists function from i18next

localization.js

GitHub: BETAFPV/BETAFPV_Configurator

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i18n.getCurrentLocale = function() {
    return i18next.language;
};

i18n.existsMessage = function(key) {
    return i18next.exists(key);
};

/**
 * Helper functions, don't depend of the i18n framework

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i18n.js

GitHub: hubot-js/hubot.js

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i18n.use(backend)
  .init(initOptions);

function t(key, vars) {
  if (isNaN(key) && i18n.exists(key)) {
    return vars ? i18n.t(key, vars) : i18n.t(key);
  }

  return key;

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