GUI: should pop-up a correct info when delete more than one pipeline

[QxiaoQ]

When user select and delete more than one pipeline, the confirmation info should be changed.

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This change is 

[k8s-ci-robot]

Hi @QxiaoQ. Thanks for your PR.

I'm waiting for a kubeflow member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[QxiaoQ]

@jinchihe

[jinchihe]

/ok-to-test

[QxiaoQ]

/area front-end

[jinchihe]

/lgtm

[Bobgy]

Thanks
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Bobgy

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