public static Unicode::ucfirst($text) Capitalizes

public static Unicode::truncate($string, $max_length, $wordsafe = FALSE, $add_ellipsis

public static Unicode::convertToUtf8($data, $encoding)

Provides Unicode-related conversions and operations. Hierarchy class \Drupal\Component\Utility\

public static Unicode::mimeHeaderEncode($string) Encodes

Matches Unicode characters that are word boundaries. Characters with the following General_category (gc) property values are used as word boundaries