Merge branch 'SDC-512-consistent-filtering' into 'master'

SDC-512 - improving filter mechanism

See merge request !251

atdb/taskdatabase/templates/taskdatabase/filter/clear_filter_button.html

 {% if request.session.filtered == True %}
-   <a href="{% url 'clear-filter' 'index' %}" class="btn btn-success btn-sm" role="button"><i class="fas fa-window-close"></i> Clear Filter</a>
-{% else %}
-   <a href="{% url 'clear-filter' 'index' %}" class="btn btn-secondary btn-sm" role="button"><i class="fas fa-window-close"></i> Clear Filter</a>
+   <a href="{% url 'clear-filter' 'index' %}" class="btn btn-success btn-sm" role="button"><i class="fas fa-window-close"></i> No Filter</a>
 {% endif %}

atdb/taskdatabase/templates/taskdatabase/quality/clear_filter_button.html

 {% if request.session.filtered == True %}
-   <a href="{% url 'clear-filter' 'quality' %}" class="btn btn-success btn-sm" role="button"><i class="fas fa-window-close"></i> Clear Filter</a>
-{% else %}
-   <a href="{% url 'clear-filter' 'quality' %}" class="btn btn-secondary btn-sm" role="button"><i class="fas fa-window-close"></i> Clear Filter</a>
+   <a href="{% url 'clear-filter' 'quality' %}" class="btn btn-success btn-sm" role="button"><i class="fas fa-window-close"></i> No Filter</a>
 {% endif %}

atdb/taskdatabase/templates/taskdatabase/query/clear_filter_button.html

 {% if request.session.filtered == True %}
-   <a href="{% url 'clear-filter' 'query' %}" class="btn btn-success btn-sm" role="button"><i class="fas fa-window-close"></i> Clear Filter</a>
+   <a href="{% url 'clear-filter' 'query' %}" class="btn btn-success btn-sm" role="button"><i class="fas fa-window-close"></i> No Filter</a>
 {% else %}
-   <a href="{% url 'clear-filter' 'query' %}" class="btn btn-secondary btn-sm" role="button"><i class="fas fa-window-close"></i> Clear Filter</a>
+   <a href="{% url 'clear-filter' 'query' %}" class="btn btn-secondary btn-sm" role="button"><i class="fas fa-window-close"></i> No Filter</a>
 {% endif %}