Add global 'barcode-scan' button

InvenTree/templates/base.html

@@ -133,6 +133,11 @@ $(document).ready(function () {
     inventreeDocReady();
     
     showCachedAlerts();
+
+    $('#barcode-scan').click(function() {
+        barcodeScanDialog();
+    });
+
 });
 
 </script>

InvenTree/templates/navbar.html

@@ -28,6 +28,11 @@
     </ul>
     <ul class="nav navbar-nav navbar-right">
         {% include "search_form.html" %}
+        <li class ='nav navbar-nav'>
+          <button id='barcode-scan' class='btn btn-default' title='{% trans "Scan Barcode" %}'>
+              <span class='fas fa-qrcode'></span>
+          </button>
+        </li>
         <li class='dropdown'>
           <a class='dropdown-toggle' data-toggle='dropdown' href="#"><span class="fas fa-user"></span> <b>{{ user.get_username }}</b></a>
           <ul class='dropdown-menu'>

InvenTree/templates/search_form.html

@@ -5,5 +5,7 @@
     <div class="form-group">
         <input type="text" name='search' class="form-control" placeholder="{% trans 'Search' %}"{% if query_text %} value="{{ query }}"{% endif %}>
     </div>
-    <button type="submit" id='search-submit' class="btn btn-default"><span class='fas fa-search'></span></button>
+    <button type="submit" id='search-submit' class="btn btn-default" title='{% trans "Search" %}'>
+        <span class='fas fa-search'></span>
+    </button>
 </form>