{% load i18n %}

{% if IS_SU %}
  <div id="djangoSuWarning" style="position: fixed; bottom: 0; width: 100%; color: white; background-color: red;">
    {% trans "WARNING : Your are connected with another account !" %}
  </div>
  <style>
    #djangoSuWarning {
      position: fixed;
      bottom: 0;
      width: 100%;
      color: white;
      background-color: red;
      text-align: center;
      font-size: 25px;
      z-index: 5000;
    }
  </style>
{% endif %}

{% load i18n %}
{% if IS_SU %}
<style>
    #django-su-warning {
        position: fixed;
        bottom: 0;
        width: 100%;
        color: white;
        background-color: red;
        text-align: center;
        font-size: 25px;
        z-index: 5000;
    }
</style>
<div id="django-su-warning">
    {% trans "WARNING: You have assumed the identity of another account!" %}
</div>
{% endif %}

Correct grammar used in warning
Correct grammar used in warning
