Adds some more translatable strings

- Mostly just to check the workflow integration

InvenTree/templates/about.html

@@ -60,7 +60,7 @@
                             </tr>
                             <tr>
                                 <td><span class='fas fa-mobile-alt'></span></td>
-                                <td>{% trans "Get the App" %}</td>
+                                <td>{% trans "Mobile App" %}</td>
                                 <td><a href="https://inventree.readthedocs.io/en/latest/app/app">https://inventree.readthedocs.io/en/latest/app/app</a></td>
                             </tr>
                             <tr>
@@ -74,7 +74,7 @@
                 </div>
             </div>
             <div class='modal-footer'>
-                <button type='button' class='btn btn-default' data-dismiss='modal'>Close</button>
+                <button type='button' class='btn btn-default' data-dismiss='modal'>{% trans "Close" %}</button>
             </div>
         </div>
     </div>

InvenTree/templates/navbar.html

@@ -10,7 +10,7 @@
       <a class="navbar-brand" id='logo' href="{% url 'index' %}" style="padding-top: 7px; padding-bottom: 5px;"><img src="{% static 'img/inventree.png' %}" width="32" height="32" style="display:block; margin: auto;"/></a>
       <div class="navbar-header">
         <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
-            <span class="sr-only">Toggle navigation</span>
+            <span class="sr-only">{% trans "Toggle navigation" %}</span>
             <span class="icon-bar"></span>
             <span class="icon-bar"></span>
             <span class="icon-bar"></span>