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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[mukeshpanchal27]

Are we still needs to update the deprecated codes?