Use correct terminology for first activations

src/views/Summit.vue

@@ -53,7 +53,9 @@
             <div>Coordinates: <Coordinates v-if="summit.coordinates" :latitude="summit.coordinates.latitude" :longitude="summit.coordinates.longitude" :altitude="summit.altitude" :reference="summit.code" /></div>
             <div>Locator: <span class="locator">{{ locator }}</span></div>
             <div v-if="$keycloak && $keycloak.authenticated && summit.coordinates">Distance/Bearing: <Bearing :latitude="summit.coordinates.latitude" :longitude="summit.coordinates.longitude" /></div>
-            <div v-if="firstActivations">First activation:
+            <div v-if="firstActivations">
+              <span v-if="firstActivations.activators.length == 1">First activation: </span>
+              <span v-else>First day's activations: </span>
               <span v-for="(activator, index) in firstActivations.activators" :key="activator.userId"><router-link :to="makeActivatorLinkUserId(activator.userId)"><strong>{{ activator.callsign }}</strong></router-link>{{ index !== firstActivations.activators.length - 1 ? ' & ' : '' }}</span>
             <span class="has-text-grey"> on {{ firstActivations.date | formatActivationDate }}</span></div>