discourse/app/assets/javascripts/discourse/templates/preferences-email.hbs

<section class='user-right user-preferences'>
  <form class="form-horizontal">

    <div class="control-group">
      <div class="controls">
        <h3>{{i18n 'user.change_email.title'}}</h3>
      </div>
    </div>

    {{#if success}}
      <div class="control-group">
        <div class="instructions">
          <p>
            {{#if currentUser.staff}}
              {{i18n 'user.change_email.success_staff'}}
            {{else}}
              {{i18n 'user.change_email.success'}}
            {{/if}}
          </p>
        </div>
      </div>
    {{else}}
      {{#if error}}
        <div class="control-group">
          <div class="instructions">
            <div class='alert alert-error'>{{errorMessage}}</div>
          </div>
        </div>
      {{/if}}

      <div class="control-group">
        <label class="control-label">{{i18n 'user.email.title'}}</label>
        <div class="controls">
          {{text-field value=newEmail id="change-email" classNames="input-xxlarge" autofocus="autofocus"}}
          {{input-tip validation=emailValidation}}
        </div>
        <div class='instructions'>
          {{#if taken}}
            {{i18n 'user.change_email.taken'}}
          {{else}}
            {{i18n 'user.email.instructions'}}
          {{/if}}
        </div>
      </div>

      <div class="control-group">
        <div class="controls">
          <button {{action "changeEmail"}} disabled={{saveDisabled}} class="btn btn-primary">{{saveButtonText}}</button>
        </div>
      </div>
    {{/if}}

  </form>
</section>