add label options to +renderBackButton

app/views/components/library.pug

@@ -50,11 +50,13 @@ mixin renderCell (label, value, className)
     div(class=className)!= value
     .uk-text-muted.uk-text-small= label
 
-mixin renderBackButton ( )
+mixin renderBackButton (options)
+  - options = Object.assign({ includeLabel: true, label: 'Back' }, options)
   button(type="button", onclick="window.history.back();").uk-button.uk-button-default
     span
       i.fas.fa-chevron-left
-    span(class="uk-visible@s").uk-margin-small-left Back
+    if options.includeLabel
+      span(class="uk-visible@s").uk-margin-small-left= options.label
 
 mixin renderUserLink (user)
   if user.coreUserId