change button names and add translation

Author: mariofranke

frontend/templates/frontend/course/dropdown_topic.html

@@ -6,22 +6,22 @@
 <div class="float-right text-right">
     <div class="dropdown show">
         <button class="btn btn-primary dropdown-toggle" type="button" id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
-            {% trans "Actions" %}
+            {% trans "Add Content" %}
         </button>
         <div class="dropdown-menu dropdown-menu-right" aria-labelledby="dropdownMenuLink">
             {% if user.is_authenticated %}
                 <a class="dropdown-item"
                        href="{% url 'frontend:content-add' course_id=course.id topic_id=topic_replace.id type='Image' %}">{% fa5_icon 'camera' 'fas' %}
-                        add image</a>
+                        {% trans "image" %}</a>
                 <a class="dropdown-item"
                        href="{% url 'frontend:content-add' course_id=course.id topic_id=topic_replace.id type='YouTubeVideo' %}">{% fa5_icon 'video' 'fas' %}
-                        add youtube video</a>
+                        {% trans "youtube video" %}</a>
                 <a class="dropdown-item"
                        href="">{% fa5_icon 'file-pdf' 'fas' %}
-                        add pdf file</a>
+                        {% trans "pdf file" %}</a>
                 <a class="dropdown-item"
                        href="">{% fa5_icon 'file' 'fas' %}
-                        add markdown file</a>
+                        {% trans "markdown file" %}</a>
             {% endif %}
 
         </div>