Placeholder improved.

Dockerfile

@@ -37,7 +37,7 @@ RUN dotnet test tests/Squidex.Infrastructure.Tests/Squidex.Infrastructure.Tests.
  && dotnet test tests/Squidex.Web.Tests/Squidex.Web.Tests.csproj
 
 # Publish
-RUN dotnet publish src/Squidex/Squidex.csproj --output /out/alpine --configuration Release -r alpine.3.7-x64 -p:version=$SQUIDEX__VERSION
+RUN dotnet publish src/Squidex/Squidex.csproj --output /out/alpine --configuration Release -r alpine.3.8-x64 -p:version=$SQUIDEX__VERSION
 
 #
 # Stage 2, Build runtime

src/Squidex/app/features/settings/pages/contributors/import-contributors-dialog.component.html

@@ -22,7 +22,7 @@
                 </ng-container>
 
             <ng-template #noStatus>
-                    <textarea class="form-control content" placeholder="user1@squidex.io;user2.squidex.io" formControlName="import"></textarea>
+                    <textarea class="form-control content" placeholder="user1@squidex.io;user2@squidex.io" formControlName="import"></textarea>
             </ng-template>
         </div>