[fix] apply changes in infobox's styles

changes were made for wolframalpha infobox:

    - wrap text inside infobox.
      for example, there's a hill in New Zealand called
      Taumatawhakatangihangakoauauotamateapokaiwhenuakitanatahu
      (don't blame me, blame the Kiwis)
      and now it doesn't break the infobox.

    - add an optional image field for infobox's attributes.
      (doesn't affect ddg infobox at all)

    - table is now always split in half.
      needed so that images stay inside infobox.
      (max-width doesn't work for inline elements, it's the table
      that has to set the width.

if you don't like how the table width looks now in ddg/wiki's infobox,
i can change that code so that the style only applies when using
wolframalpha.

searx/templates/default/infobox.html

@@ -7,7 +7,14 @@
     <div class="attributes">
         <table>
             {% for attribute in infobox.attributes %}
-            <tr><td>{{ attribute.label }}</td><td>{{ attribute.value }}</td></tr>
+            <tr>
+                <td>{{ attribute.label }}</td>
+                {% if attribute.image %}
+                <td><img src="{{ image_proxify(attribute.image.src) }}" alt="{{ attribute.image.alt }}" /></td>
+                {% else %}
+                <td>{{ attribute.value }}</td>
+                {% endif %}
+            </tr>
             {% endfor %}
         </table>
     </div>