Create slots for prepend and append in AbsenceReasonChip

aleksis/apps/kolego/frontend/components/AbsenceReasonChip.vue

@@ -47,7 +47,9 @@ export default {
         <span>{{ $t("kolego.absence_reason.default") }}</span>
       </v-tooltip>
     </v-avatar>
+    <slot name="prepend" />
     {{ text }}
+    <slot name="append" />
     <v-avatar right v-if="loading">
       <v-progress-circular indeterminate :size="16" :width="2" />
     </v-avatar>