Habilitar SVG no wordpress. Cole isso no seu functions.

functions.php

<?php 
// ############### ACEITAR SVG NO WORDPRESS ###############
function bodhi_svgs_upload_mimes( $mimes = array() ) {
  if ( current_user_can( 'administrator' ) ) {
    // allow SVG file upload
    $mimes['svg'] = 'image/svg+xml';
    $mimes['svgz'] = 'image/svg+xml';
    return $mimes;
  } else {
    return $mimes;
  }
}
add_filter( 'upload_mimes', 'bodhi_svgs_upload_mimes', 99 );

/**
 * Check Mime Types
 */
function bodhi_svgs_upload_check( $checked, $file, $filename, $mimes ) {

  if ( ! $checked['type'] ) {

    $check_filetype   = wp_check_filetype( $filename, $mimes );
    $ext        = $check_filetype['ext'];
    $type       = $check_filetype['type'];
    $proper_filename  = $filename;

    if ( $type && 0 === strpos( $type, 'image/' ) && $ext !== 'svg' ) {
      $ext = $type = false;
    }

    $checked = compact( 'ext','type','proper_filename' );
  }

  return $checked;

}
add_filter( 'wp_check_filetype_and_ext', 'bodhi_svgs_upload_check', 10, 4 );
// ############### FINAL SVG NO WORDPRESS ###############
?>