Amend Deprecation pop-up text

[cessda-bitbucket-importer]

Original report on BitBucket by Taina Jääskeläinen.

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The second notification of the code deprecation says:

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I noticed that the meaning of the second sentence is easily misread. Please change this sentence to:

If there are children codes and you want to keep them change first their place in the hierarchy, moving them not to be the children of [code]. Do the deprecation only after this.

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No changes in the other sentences of the notification.

[cessda-bitbucket-importer]

Original comment by Stefan Dlugolinsky (GitHub: Stifo).

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changed as requested

[cessda-bitbucket-importer]

Original comment by Taina Jääskeläinen.

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Checked in staging, text change implemented.

[cessda-bitbucket-importer]

Original comment by John Shepherdson (GitHub: john-shepherdson).

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Fixed typo in title