Prevent virtual keyboard login auto capitalization

Stops virtual keyboards, such as the ones on mobile devices, to default to uppercase for the first letter of the login user input field.

cps/templates/login.html

@@ -7,7 +7,7 @@
     <input type="hidden" name="csrf_token" value="{{ csrf_token() }}">
     <div class="form-group">
       <label for="username">{{_('Username')}}</label>
-      <input type="text" class="form-control" id="username" name="username" placeholder="{{_('Username')}}">
+      <input type="text" class="form-control" id="username" name="username" autocapitalize="off" placeholder="{{_('Username')}}">
     </div>
     <div class="form-group">
       <label for="password">{{_('Password')}}</label>