arabic.css

.example-arabic .tt-dropdown-menu {
  text-align: right;
}

arabic.html

<div class="example-arabic">
  <input class="typeahead" type="text" placeholder="نعم">
</div>

arabic.js

var arabic = new Bloodhound({
  datumTokenizer: function(d) { return Bloodhound.tokenizers.whitespace(d.word); },
  queryTokenizer: Bloodhound.tokenizers.whitespace,
  local: [
    { word: "الإنجليزية" },
    { word: "نعم" },
    { word: "لا" },
    { word: "مرحبا" },
    { word: "أهلا" }
  ]
});

arabic.initialize();

$('.example-arabic .typeahead').typeahead({
  hint: false
},
{
  name: 'arabic',
  displayKey: 'word',
  source: arabic.ttAdapter()
});