Reduce the repetitive UL and LI for left menu

This will reduce the repetition that we currently have for left menu.

from
```php
<ul class="list-group menu list-unstyled">
    <li>
        <h3><a href="/contact-en.php">Contact Us</a></h3>
        <ul class="list-group menu list-unstyled">
            <li><a class="list-group-item" href="/contact-en.php?id=01">By mail</a></li>
            <li><a class="list-group-item" href="/contact-en.php?id=02">Filling a Complaint</a></li>
            <li><a class="list-group-item" href="/contact-en.php?id=03">Media contacts</a></li>
        </ul>
    </li>
</ul>

```
to
```php
<h3><a href="/contact-en.php">Contact Us</a></h3>
<ul class="list-group menu list-unstyled">
    <li><a class="list-group-item" href="/contact-en.php?id=01">By mail</a></li>
    <li><a class="list-group-item" href="/contact-en.php?id=02">Filling a Complaint</a></li>
    <li><a class="list-group-item" href="/contact-en.php?id=03">Media contacts</a></li>
</ul>
```
Merge pull request #121 from crochefort/patch-1

Reduce the repetitive UL and LI for left menu