FIX: missing space in qr modal

frontend/src/views/macauth/MACAuth.vue

@@ -44,7 +44,7 @@
                 :object_title="db_editor_object_title"
       ></DBEditor>
       <b-modal ok-only id="macauth-show-qr" v-if="qr_item" centered
-               :title="$t('views.macauth.wifi_qr_code_for') + '\'' + qr_item.mac_addr + '\''">
+               :title="$t('views.macauth.wifi_qr_code_for') + ' \'' + qr_item.mac_addr + '\''">
         <p class="text-center">
           <qrcode-vue v-if="qr_item" :value="'WIFI:S:KIT-IoT;T:WPA;P:'+encodeQr(qr_item.wpa_key)+';;'"></qrcode-vue>
         </p>