revert language support column in preferences

searx/templates/oscar/preferences.html

 				    <th>{{ _("Allow") }}</th>
 				    <th>{{ _("Engine name") }}</th>
 				    <th>{{ _("Shortcut") }}</th>
-				    <th>{{ _("Language support") }}</th>
+				    <th>{{ _("Supports selected language") }}</th>
 				    <th>{{ _("SafeSearch") }}</th>
 				    <th>{{ _("Time range") }}</th>
 				    <th>{{ _("Avg. time") }}</th>
 				    <th>{{ _("Max time") }}</th>
 				    <th>{{ _("Avg. time") }}</th>
 				    <th>{{ _("SafeSearch") }}</th>
-				    <th>{{ _("Language support") }}</th>
+				    <th>{{ _("Supports selected language") }}</th>
 				    <th>{{ _("Shortcut") }}</th>
 				    <th>{{ _("Engine name") }}</th>
 				    <th>{{ _("Allow") }}</th>
                                     </td>
                                     <th>{{ search_engine.name }}</th>
 				    <td>{{ shortcuts[search_engine.name] }}</td>
-				    <td><input type="checkbox" {{ "checked" if search_engine.supported_languages else ""}} readonly="readonly" disabled="disabled"></td>
+				    <td><input type="checkbox" {{ "checked" if current_language == 'all' or current_language in search_engine.supported_languages or current_language.split('-')[0] in search_engine.supported_languages else ""}} readonly="readonly" disabled="disabled"></td>
 				    <td><input type="checkbox" {{ "checked" if search_engine.safesearch==True else ""}} readonly="readonly" disabled="disabled"></td>
 				    <td><input type="checkbox" {{ "checked" if search_engine.time_range_support==True else ""}} readonly="readonly" disabled="disabled"></td>
 				    <td class="{{ 'danger' if stats[search_engine.name]['warn_time'] else '' }}">{{ 'N/A' if stats[search_engine.name].time==None else stats[search_engine.name].time }}</td>