Fix some typos

Signed-off-by: Marcin Mikołajczak <me@m4sk.in>

front/src/views/admin/users/UsersDetail.vue

@@ -143,7 +143,7 @@ export default {
   computed: {
     labels () {
       return {
-        inactive: this.$gettext('Determine if the user account is active or not. Inactive users cannot login or user the service.')
+        inactive: this.$gettext('Determine if the user account is active or not. Inactive users cannot login or use the service.')
       }
     },
     allPermissions () {

front/src/views/federation/LibraryDetail.vue

@@ -93,7 +93,7 @@
                     </translate>
                   </template>
                   <template v-else>
-                    <translate>Unkwnown</translate>
+                    <translate>Unknown</translate>
                   </template>
                 </td>
                 <td></td>