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JavaScript

var translations = {
  "END": true, 
  "Lines": "End Reached", 
  "term0": {
    "PrincipalTranslations": {
        "term0-object" : "Hello"
    }
  },
  "term1": {
    "PrincipalTranslations": {
        "term1-object" : "world"
    }
  }
}
$.each(translations, function(term, value) {
    if (value.PrincipalTranslations !== undefined) {
        console.log(value.PrincipalTranslations);
    }
});