I18N: Replace `php.ini`, `post_max_size`, and `upload_max_filesize` with...

I18N: Replace `php.ini`, `post_max_size`, and `upload_max_filesize` with placeholders in "File is empty" error message.

Props ramiy.
Fixes #48868.
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git-svn-id: https://core.svn.wordpress.org/trunk@46843 1a063a9b-81f0-0310-95a4-ce76da25c4cd