automatic search when language is selected

searx/static/plugins/js/search_on_category_select.js

                 $('#search_form').submit();
             }
         });
+        $('#language').change(function(e) {
+            if($('#q').val()) {
+                $('#search_form').submit();
+            }
+        });
     }
 });

searx/templates/oscar/languages.html

 {% if preferences %}
 <select class="form-control" name='language'>
 {% else %}
-<select class="time_range" name='language'>
+<select class="time_range" id='language' name='language'>
 {% endif %}
 	<option value="all" {% if current_language == 'all' %}selected="selected"{% endif %}>{{ _('Default language') }}</option>
 		{% for lang_id,lang_name,country_name,english_name in language_codes | sort(attribute=1) %}