Make absence entering alert more responsive

aleksis/apps/chronos/frontend/components/substitutions/SubstitutionOverview.vue

@@ -53,11 +53,10 @@ import {
 
       <v-alert type="info" outlined dense class="full-width">
         <v-row align="center" no-gutters>
-          <v-col class="grow">
+          <v-col cols="12" md="9">
             {{ $t("chronos.substitutions.overview.info_alert.text") }}
           </v-col>
-          <v-spacer></v-spacer>
-          <v-col class="shrink">
+          <v-col cols="12" md="3" align="right">
             <v-btn
               color="info"
               outlined