[enh] oscar_template: improve result visualisation

* highlight parts of result
* add link to archiv.to
* fix little bugs
* add little icons
* change style of "show map" button

searx/templates/oscar/result_templates/images.html

@@ -11,7 +11,7 @@
             </div>
             <div class="modal-body">
                 <img class="img-responsive center-block" src="{{ result.img_src }}" alt="{{ result.title }}">
-                {% if result.content %}<p>{{ result.content|safe }}</p>{% endif %}
+                {% if result.content %}<p class="result-content">{{ result.content|safe }}</p>{% endif %}
             </div>
             <div class="modal-footer">
                 <div class="clearfix"></div>