Twenty Fifteen: Remove `esc_html()` from blog description.

The blog description gets esc_html()'d *into* the DB. It's also escaped because the filter for `get_bloginfo()` is set to 'display'.

see #30724.
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git-svn-id: http://core.svn.wordpress.org/trunk@30887 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fifteen: Don't escape translated strings.

Replace every unnecessary instance of `esc_html_x()` with just `_x()`.

see #30724.
Built from https://develop.svn.wordpress.org/trunk@30899


git-svn-id: http://core.svn.wordpress.org/trunk@30889 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove caching for `get_term_by()` calls.

The new cache group scheme causes term invalidation to be overly broad, so
that busting the cache for one term will bust the cache for all terms in the
taxonomy. We'll have another go at more focused use of the 'last_changed'
incrementor in a future release.

Reverts [29915], [30073], [30080], [30108], [30112].
See #21760.
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git-svn-id: http://core.svn.wordpress.org/trunk@30890 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fifteen: Remove `esc_html()` from `get_the_author()`.

The display name is sanitized through `sanitize_text_field`, `wp_filter_kses`, and `_wp_specialchars`.

see #30724.
Built from https://develop.svn.wordpress.org/trunk@30901


git-svn-id: http://core.svn.wordpress.org/trunk@30891 1a063a9b-81f0-0310-95a4-ce76da25c4cd