Mark injected strings as safe

InvenTree/templates/account/login.html

@@ -36,7 +36,7 @@ for a account and sign in below:{% endblocktrans %}</p>
 
   <hr>
   {% if login_message %}
-  <div>{{ login_message }}<hr></div>
+  <div>{{ login_message | safe }}<hr></div>
   {% endif %}
   <div class="btn-group float-right" role="group">
     <button class="btn btn-success" type="submit">{% trans "Sign In" %}</button>

InvenTree/templates/navbar.html

@@ -90,7 +90,7 @@
     {% if navbar_message %}
       {% include "spacer.html" %}
       <div class='flex justify-content-center'>
-        {{ navbar_message }}
+        {{ navbar_message | safe }}
       </div>
       {% include "spacer.html" %}
       {% include "spacer.html" %}