[16/49] filters: Use the glyphicons for add/remove signs

diff --git a/htdocs/css/style.css b/htdocs/css/style.css
index 62b0c3c..fcf5ac8 100644
--- a/htdocs/css/style.css
+++ b/htdocs/css/style.css
@@ -140,6 +140,11 @@  table.patchlist td.patchlistfilters {
 	border-bottom: thin solid black;
 	font-size: smaller;
 }
+
+td.patchlistfilters a {
+   color: black;
+}
+
 table.patchlist td.patchlistreorder {
 	background: #c0c0ff;
 	border-top: thin solid gray;
diff --git a/htdocs/images/16-circle-blue-add.png b/htdocs/images/16-circle-blue-add.png
deleted file mode 100644
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diff --git a/htdocs/images/16-circle-blue-remove.png b/htdocs/images/16-circle-blue-remove.png
deleted file mode 100644
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diff --git a/patchwork/templates/patchwork/filters.html b/patchwork/templates/patchwork/filters.html
index 10ca587..7652db5 100644
--- a/patchwork/templates/patchwork/filters.html
+++ b/patchwork/templates/patchwork/filters.html
@@ -149,17 +149,14 @@  function submitter_field_change(field)
   {% for filter in filters.applied_filters %}
    {{ filter.name }} = {{ filter.condition }}
     {% if not filter.forced %}
-     <a href="{{ filter.url_without_me }}"><img
-      width="16" height="16" alt="remove filter" title="remove filter"
-      src="{% static "images/16-circle-blue-remove.png" %}"></a>
+     <a href="{{ filter.url_without_me }}">&nbsp;&nbsp;<span
+      class="glyphicon glyphicon-minus-sign" /></a>
     {% endif %}
    {% if not forloop.last %}&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;{% endif %}
   {% endfor %}
  {% else %}
-  none
-  <a href="javascript:filter_click()"><img
-  width="16" height="16" alt="add filter" title="add filter"
-  src="{% static "images/16-circle-blue-add.png" %}"></a>
+  none&nbsp;&nbsp;<a href="javascript:filter_click()"><span
+   class="glyphicon glyphicon-plus-sign"></span></a>
  {% endif %}
  </div>
  <div id="filterform" style="padding-top: 1em; display: none">