select picker bootstrap change noneSelectedText

Set title attribute to your selects.

<select multiple title="Empty" class="selectpicker">
    <option>1</option>
    <option>2</option>
    <option>3</option>
    <option>4</option>
</select>

<select multiple title="No Value" class="selectpicker">
    <option>1</option>
    <option>2</option>
    <option>3</option>
</select>

$('.selectpicker').selectpicker();

JSFiddle

with help of - this I tried it works .

1st step - we have to add data-none-selected-text attribute in Html select tag. example -

<select name="your_sel_name" multiple class="form-control selectpicker" data-selected-text-format="count" data-none-selected-text >

2nd Step - in js on page load use noneSelectedText option
example -

$(".selectpicker").selectpicker({
        noneSelectedText : 'Please Select' // by this default 'Nothing selected' -->will change to Please Select
    });

Hope it will Help some-one Thanks!