Replace _x() with __() and translators comments in wp-login.php

[ramiy]

Context function _x() is used to differ two similar strings with different meanings. Translators comments are used to describe %s placeholders.

The attached patch is replacing:

/* translators: %s: site title */
_x( '← Back to %s', 'site' )

with:

/* translators: %s: site title */
__( '← Back to %s' )

There is only one string of this kind. We don't need to use context functions in here. And the %s placeholder is described in translators comments, not in the context area.

[SergeyBiryukov]

The context is intentional here, see #37095.

[ramiy]

@SergeyBiryukov Those are two different po/mo files. One string is in ru_RU.mo and the other is in admin-ru_RU.mo.

[SergeyBiryukov]

If the same string is used both on the front end an in the admin, it only exists in the general (non-admin) translation file. The translation in the admin was incorrect because of that.

We could remove the context in wp-login.php and keep it in wp-admin/edit-tag-form.php, but I'd prefer to keep it on both strings for clarity.