message: refactor((frontend) user admin): differentiate the two allerts on the page
diff: <v-toolbar-title>Send invites to multiple adresses</v-toolbar-title>
  </v-toolbar>
  <v-card-text>
  - <v-alert v-model="success" timeout="3000" dismissible type="success">
  + <v-alert v-model="success" prominent timeout="3000" dismissible type="success">
  Great! All invites were sent.
  </v-alert>
  - <v-alert v-model="showError" dismissible type="error">
  + <v-alert v-model="showError" prominent dismissible type="error">
  <p>Invite send failed for adresses:</p>
  <ul>
  <li v-for="error in errors" :key="error.email">{{ error.email }}: {{ error.reason }}</li>
  </v-chip>
  </template>
  </v-combobox>
  - Optionaly invite users to stream.
  + <v-text v-if="!selectedStream">Optionaly invite users to stream.</v-text>
  <stream-search-bar
  v-if="!selectedStream"
  :gotostreamonclick="false"
  class="py-3"
  @select="setStream"
  />
  - <v-alert v-else type="success" dismissible @input="dismiss">
  + <v-alert v-else text dense type="info" dismissible @input="dismiss">
  They will be invited to be collaborators on {{ selectedStream.name }} stream.
  </v-alert>
  <v-card-actions>
  