A snippet of code for replacing certain Weight Tracker words

gistfile1.txt

/**
 * Filter default WordPress translate functions to look for key Weight Tracker words and replace.
 *
 * @param $translation
 * @param $text
 * @param $domain
 *
 * @return string
 */
function wl_ls_cust_replace_words( $translation, $text, $domain ) {

	/**
	 * Only look at Weight Tracker translations!
	 */
	if ( $domain !== 'weight-loss-tracker' ) {
		return $translation;
	}

	$lookup = [
		'kg' => 'Replacement word',
		'Kg' => 'Replacement word',
		'weight' => 'Replacement word',
		'Weight' => 'Replacement word'
	];

	return ( false === empty( $lookup[ $text ] ) ) ? $lookup[ $text ] : $translation;

}
add_filter( 'gettext', 'wl_ls_cust_replace_words', 10, 3 );