Correct escape function.

When outputting into an attribute, use `esc_attr()` instead of
`esc_html()`
i18n functions should only be passed strings.

Don’t use filters or variables inside internationalization functions.
This can break gettext calls and make our translators hate us. :(

See
https://github.com/Automattic/jetpack/commit/c6d86409826bb82c815cbda93ba
f52979b7065c1
Tidying some whitespace issues.

See
https://github.com/Automattic/jetpack/commit/c6d86409826bb82c815cbda93ba
f52979b7065c1 for gravatar-profile.php
See
https://github.com/Automattic/jetpack/commit/c4b516c05f982bc7b7749358d6d
03dc5203b1814 for grunion-contact-form.php
See
https://github.com/Automattic/jetpack/commit/ff328e297d18468623acce829a4
2d2fe9d7d3eee for subscriptions.css
Grunion: Ensure we're escaping the placeholder.

Otherwise, someone could squeeze in malicious code via the shortcode.
See
https://github.com/Automattic/jetpack/commit/c4b516c05f982bc7b7749358d6d
03dc5203b1814