var array1 = [ 'a', 'b', 'c' ];

{
  alphabetical: {
    a: {
      a.json: "Alpha",
      a1.json: "Alpha1"
    }
    b: {
      b.json: "Beta",
      b1.json: "Beta1"
    }
    c: {
      c.json: "Charlie",
      c1.json: "Charlie1"
    }
  }
}

localeObject[locale] = Object(data.last_update);


{
"alphabetical": {
    "a": "Alpha1",
    "b": "Beta1"
  }
}

localeObject[locale] = {};
    localeObject[locale][fileName] = {};
    localeObject[locale][fileName] = data.last_update