Wordpress Reading time function with I18n Support

extras.php

<?php

if ( ! function_exists( 'reading_time' ) ):
	/**
	 * Display post reading time in minutes
	 *
	 * @param $post_content
	 *
	 * @return string
	 */
	function reading_time( $post_content ) {
		$word_count  = str_word_count( strip_tags( $post_content ) );
		$readingtime = ceil( $word_count / 200 );

		$est = sprintf( // WPCS: XSS OK.
			esc_html( _nx(
				'1 minute to read',
				'%1$s minutes to read',
				$readingtime,
				'minutes to read',
				'my_domain'
			) ),
			number_format_i18n( $readingtime )

		);

		return $est;
	}
endif;

pt-BR.po

#: ../inc/extras:107
#, php-format
msgctxt "minutes to read"
msgid "1 minute to read"
msgid_plural "%1$s minutes to read"
msgstr[0] "1 minuto para ler"
msgstr[1] "%1$s minutos para ler"