Add word-break property to screen reader only classes.

[peterwilsoncc]

Adds word-break: normal !important to various screen reader only CSS.

This prevents screen readers from announcing the text as it would appear visually, eg "A P P E A R space V I S U A L L Y".

Trac ticket: https://core.trac.wordpress.org/ticket/64375

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[github-actions]

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[github-actions]

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[joedolson]

Added two additional cases that were omitted in the PR; restored one that had been removed in a deprecated function. Could go either way on that, but I think it's better to fix the issue even if it's going to be rarely used.

[github-actions]

A commit was made that fixes the Trac ticket referenced in the description of this pull request.

SVN changeset: 61636
GitHub commit: ed2c275

This PR will be closed, but please confirm the accuracy of this and reopen if there is more work to be done.