ui-default: init

将ui-default合并至主存储库便于维护

packages/ui-default/templates/partials/problem_lucky.html

@@ -0,0 +1,10 @@
+<div data-fragment-id="problem_lucky">
+  <p>
+    <a href="{{ url('problem_random', query={category:category}) if category else url('problem_random') }}" class="expanded button" target="_blank">
+      <span class="icon icon-feeling-lucky"></span> {{ _('Lucky') }}
+    </a>
+  </p>
+  <div class="typo supplementary">
+    <p>{{ _('Pick a problem randomly based on current filter') }}</p>
+  </div>
+</div>