[fix] replace modal-content class to prevent remote content load

details: http://stackoverflow.com/questions/18378720/bootstrap-3-with-remote-modal

searx/static/themes/oscar/less/logicodev/results.less

 .result .text-muted small {
     word-wrap: break-word;
 }
+
+.modal-wrapper {
+    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.5);
+}
+
+.modal-wrapper {
+    background-clip: padding-box;
+    background-color: #fff;
+    border: 1px solid rgba(0, 0, 0, 0.2);
+    border-radius: 6px;
+    box-shadow: 0 3px 9px rgba(0, 0, 0, 0.5);
+    outline: 0 none;
+    position: relative;
+}

searx/static/themes/oscar/less/pointhi/results.less

 .result .text-muted small {
     word-wrap: break-word;
 }
+
+.modal-wrapper {
+    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.5);
+}
+
+.modal-wrapper {
+    background-clip: padding-box;
+    background-color: #fff;
+    border: 1px solid rgba(0, 0, 0, 0.2);
+    border-radius: 6px;
+    box-shadow: 0 3px 9px rgba(0, 0, 0, 0.5);
+    outline: 0 none;
+    position: relative;
+}

searx/templates/oscar/result_templates/images.html

 
 <div class="modal fade" id="modal-{{ index }}" tabindex="-1" role="dialog" aria-hidden="true">
     <div class="modal-dialog">
-        <div class="modal-content">
+        <div class="modal-wrapper">
             <div class="modal-header">
                 <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">&times;</span><span class="sr-only">Close</span></button>
                 <h4 class="modal-title">{% if result.engine~".png" in favicons %}{{ draw_favicon(result.engine) }} {% endif %}{{ result.title|striptags }}</h4>