Administration: Improve output escaping in template.php

[SainathPoojary]

Trac ticket: #32233

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[apermo]

Besides the one note, which needs attention, the rest looks good to me. Good catches!

[apermo]

wp_kses_post() allows <p>, which would be semantically wrong.

cc @dmsnell

[SainathPoojary]

Ah, good catch! You're right, wp_kses_post() is too permissive here. Would switching to wp_kses_data() be a better fit since it strips out block elements like <p> but still allows standard inline formatting (like links and bold text)?