gistfile1.phtml

<?php
add_filter( 'gettext', 'een_excerpt_meta', 10, 2 );
/**
 * Rename the excerpt label and description.
 *
 * @since 0.1.0
 *
 * @param type $translation
 * @param type $original
 *
 * @return type
 */
function een_excerpt_meta( $translation, $original ) {
  if ( 'Excerpt' == $original ) {
    return __( '<span style="color:#007aff;">G</span><span style="color:#e10728;">o</span><span style="color:#ffda21;">o</span><span style="color:#007aff;">g</span><span style="color:#23b12a;">l</span><span style="color:#e10728;">e</span> meta description', 'een' );
  } else {
    $pos = strpos( $original, 'Excerpts are optional hand-crafted summaries of your' );
    if ( $pos !== false ) {
      return __( 'The meta description can be used to determine the text used under the title on search engine results pages.', 'een' );
    }
  }
  return $translation;
}