Avoid using HTML tags in translation strings (wp-admin/install.php)

[ramiy]

See the attached patch.

[ramiy]

Old strings:

• Your <code>wp-config.php</code> file has an empty database table prefix, which is not supported.
• The constant DO_NOT_UPGRADE_GLOBAL_TABLES cannot be defined when installing WordPress.

New strings:

• Your %s file has an empty database table prefix, which is not supported.
• The constant %s cannot be defined when installing WordPress.

[ramiy]

In the first string the <code>wp-config.php</code> was replaced with %s placeholder.

In the second string I add code tags to the DO_NOT_UPGRADE_GLOBAL_TABLES constant. And I replaced it with %s, moving the constant out of the string with the code tag.

[SergeyBiryukov]

In 36665:

I18N: Remove <code> tags from translatable strings in wp-admin/install.php.

Props ramiy.
Fixes #35738.