Introduce card-meta class for modules

_layouts/module.html

 <div class="module">
-  <h3 class="module-header"><strong class="module-week">{{ page.week }}</strong> {{ page.title }}</h3>
+  <h3 class="module-header"><strong class="module-meta">{{ page.week }}</strong> {{ page.title }}</h3>
   {% if page.days %}
   <dl class="module-days">
     {% for day in page.days %}

_sass/custom/card.scss

@@ -23,3 +23,9 @@
 .card-body {
   flex: 1 1 auto;
 }
+
+.card-meta {
+  @extend .label;
+  border-radius: $border-radius;
+  padding-bottom: 0;
+}

_sass/custom/module.scss

@@ -60,9 +60,8 @@
     }
 
     .label {
-      border-radius: $border-radius;
+      @extend .card-meta;
       margin-left: 0;
-      padding-bottom: 0;
 
       &.label-hw-out {
         @extend .label-yellow;
@@ -79,9 +78,8 @@
   }
 }
 
-.module-week {
-  @extend .label, .text-grey-dk-100, .bg-grey-lt-200;
-  border-radius: $border-radius;
+.module-meta {
+  @extend .card-meta, .text-grey-dk-100, .bg-grey-lt-200;
 }
 
 .module-header {