How to change the hamburger menu to the word menu in shopify

I am using the theme Simple in my Shopify store and I need to change the hamburger menu into the text “menu” instead. Also the website is www.allabouttoytrains.com I was playing with the inspect element trying to get the desired effect but I’m also posting the file containing the HTML incase it helps.

sidebar.liquid

<div data-section-id="{{ section.id }}" data-section-type="sidebar-section">
  <nav class="grid__item small--text-center medium-up--one-fifth" role="navigation">
    <hr class="hr--small medium-up--hide">
    <button id="ToggleMobileMenu" class="mobile-menu-icon medium-up--hide" aria-haspopup="true" aria-owns="SiteNav">
      <span class="line"></span>
      <span class="line"></span>
      <span class="line"></span>
      <span class="line"></span>
      <span class="icon__fallback-text">{{ 'layout.navigation.menu' | t }}</span>
    </button>
    <div id="SiteNav" class="site-nav" role="menu">
      <ul class="list--nav">
        {% for link in menus[section.settings.main_menu_link_list].links %}
          {% assign child_list_handle = link.title | handleize %}
          {% if menus[child_list_handle].links != blank %}
            <li class="site-nav--has-submenu site-nav__element">
              <button class="site-nav__link btn--link site-nav__expand hidden" aria-expanded="false" aria-controls="Collapsible{{ forloop.index }}">
                {{ link.title }}
                <span>+</span>
              </button>
              <button class="site-nav__link btn--link site-nav__collapse" aria-expanded="true" aria-controls="Collapsible{{ forloop.index }}">
                {{ link.title }}
                <span>-</span>
              </button>
              <ul id="Collapsible{{ forloop.index }}" class="site-nav__submenu site-nav__submenu--expanded" aria-hidden="false">
                {% for childlink in menus[child_list_handle].links %}
                  <li class="{% if childlink.active or collection.current_type == childlink.title or collection.current_vendor == childlink.title %}{% unless forloop.first and childlink.title contains 'All' and current_tags.size > 0 %} site-nav--active {% endunless %}{% endif %}">
                    <a href="{{ childlink.url }}" class="site-nav__link">{{ childlink.title | escape }}</a>
                  </li>
                {% endfor %}
              </ul>
            </li>
          {% else %}
            <li class="site-nav__element {% if link.active %}site-nav--active{% endif %}">
              <a href="{{ link.url }}" class="site-nav__link">{{ link.title }}</a>
            </li>
          {% endif %}
        {% endfor %}
        {% if shop.customer_accounts_enabled %}
          {% if customer %}
            <li>
              <a href="/account" class="site-nav__link site-nav--account medium-up--hide">{{ 'layout.customer.account' | t }}</a>
            </li>
            <li>
              <a href="/account/logout" class="site-nav__link site-nav--account medium-up--hide">{{ 'layout.customer.log_out' | t }}</a>
            </li>
          {% else %}
            <li>
              <a href="/account/login" class="site-nav__link site-nav--account medium-up--hide">{{ 'layout.customer.log_in' | t }}</a>
            </li>
            <li>
              <a href="/account/register" class="site-nav__link site-nav--account medium-up--hide">{{ 'layout.customer.create_account' | t }}</a>
            </li>
          {% endif %}
        {% endif %}
      </ul>
      <ul class="list--inline social-links">
        {% if settings.social_facebook_link != blank %}
          <li>
            <a href="{{ settings.social_facebook_link }}" title="{{ 'layout.footer.social_platform' | t: name: shop.name, platform: 'Facebook' }}">
              {% include 'icon-facebook' %}
              <span class="icon__fallback-text">Facebook</span>
            </a>
          </li>
        {% endif %}
        {% if settings.social_twitter_link != blank %}
          <li>
            <a href="{{ settings.social_twitter_link }}" title="{{ 'layout.footer.social_platform' | t: name: shop.name, platform: 'Twitter' }}">
              {% include 'icon-twitter' %}
              <span class="icon__fallback-text">Twitter</span>
            </a>
          </li>
        {% endif %}
        {% if settings.social_pinterest_link != blank %}
          <li>
            <a href="{{ settings.social_pinterest_link }}" title="{{ 'layout.footer.social_platform' | t: name: shop.name, platform: 'Pinterest' }}">
              {% include 'icon-pinterest' %}
              <span class="icon__fallback-text">Pinterest</span>
            </a>
          </li>
        {% endif %}
        {% if settings.social_instagram_link != blank %}
          <li>
            <a href="{{ settings.social_instagram_link }}" title="{{ 'layout.footer.social_platform' | t: name: shop.name, platform: 'Instagram' }}">
              {% include 'icon-instagram' %}
              <span class="icon__fallback-text">Instagram</span>
            </a>
          </li>
        {% endif %}
        {% if settings.social_google_plus_link != blank %}
          <li>
            <a href="{{ settings.social_google_plus_link }}" rel="publisher" title="{{ 'layout.footer.social_platform' | t: name: shop.name, platform: 'Google Plus' }}">
              {% include 'icon-google-plus' %}
              <span class="icon__fallback-text">Google Plus</span>
            </a>
          </li>
        {% endif %}
        {% if settings.social_tumblr_link != blank %}
          <li>
            <a href="{{ settings.social_tumblr_link }}" title="{{ 'layout.footer.social_platform' | t: name: shop.name, platform: 'Tumblr' }}">
              {% include 'icon-tumblr' %}
              <span class="icon__fallback-text">Tumblr</span>
            </a>
          </li>
        {% endif %}
        {% if settings.social_youtube_link != blank %}
          <li>
            <a href="{{ settings.social_youtube_link }}" title="{{ 'layout.footer.social_platform' | t: name: shop.name, platform: 'YouTube' }}">
              {% include 'icon-youtube' %}
              <span class="icon__fallback-text">YouTube</span>
            </a>
          </li>
        {% endif %}
        {% if settings.social_vimeo_link != blank %}
          <li>
            <a href="{{ settings.social_vimeo_link }}" title="{{ 'layout.footer.social_platform' | t: name: shop.name, platform: 'Vimeo' }}">
              {% include 'icon-vimeo' %}
              <span class="icon__fallback-text">Vimeo</span>
            </a>
          </li>
        {% endif %}
        {% if settings.social_fancy_link != blank %}
          <li>
            <a href="{{ settings.social_fancy_link }}" title="{{ 'layout.footer.social_platform' | t: name: shop.name, platform: 'Fancy' }}">
              {% include 'icon-fancy' %}
              <span class="icon__fallback-text">Fancy</span>
            </a>
          </li>
        {% endif %}
        {% if settings.main_blog != blank %}
          <li>
            <a href="/blogs/{{ settings.main_blog }}.atom">
              {% include 'icon-rss' %}
              <span class="icon__fallback-text">Blog</span>
            </a>
          </li>
        {% endif %}
      </ul>
    </div>
    <hr class="medium-up--hide hr--small {% if template.name == 'index' %}hr--border-bottom{% endif %}">
  </nav>
</div>

{% schema %}
  {
    "name": "Sidebar",
    "settings": [
      {
        "type": "link_list",
        "id": "main_menu_link_list",
        "label": "Menu",
        "default": "main-menu"
      }
    ]
  }
{% endschema %}