Set translated default label for VR field

aleksis/apps/lesrooster/frontend/components/validity_range/ValidityRangeField.vue

@@ -9,6 +9,7 @@ import DateField from "aleksis.core/components/generic/forms/DateField.vue";
     v-on="$listeners"
     :fields="headers"
     create-item-i18n-key="lesrooster.validity_range.create_validity_range"
+    :label="$t('labels.select_validity_range')"
     :gql-query="gqlQuery"
     :gql-create-mutation="gqlCreateMutation"
     :gql-patch-mutation="{}"