adjust {{type}} adding "s" to pluralise

vue-theme/src/components/sidebars/sidebar.vue

     section
         //- if not single layout with sorting
         .shadow(v-if="shouldShowListSort.includes(type) && layout !== 'single'")
-            h3.t-up sort {{ type }}
+            h3.t-up sort {{ type }}s
             ul.t-up
                 li 
                     //- post?type=articles //
         
         //- if {{type}} has sorted by-material show material sets
         .shadow(v-if="shouldShowMaterialSort.includes(type) && layout !== 'single'")
-            h3.t-up {{ type }} by material
+            h3.t-up {{ type }}s by material
             ul.t-up
                 li
                     template(v-for="material in materials") 
 
         //- if {{type}} has sorted by-episode show episode sets           
         .shadow(v-if="shouldShowEpisodeSort.includes(type) && layout !== 'single'")
-            h3.t-up {{ type }} by episode  
+            h3.t-up {{ type }}s by episode  
             ul.t-up
                 li.f-row.start.wrap
                     template(v-for="episodeSet in episodeSets") 
 
         //- if {{type}} has sorted by-type show subtype sets           
         .shadow(v-if="shouldShowTypeSort.includes(type) && layout !== 'single'")
-            h3.t-up {{ type }} type  
+            h3.t-up {{ type }}s type  
             ul.t-up
                 li
                     template(v-for="subtypeSet in subtypeSets")