t() calls should be avoided in classes.

$ phpcs --standard=Drupalpractice --extensions=php,module,inc,install,test,profile,theme,css,info,txt,md,yml fontawesome_iconpicker/
Xdebug: [Step Debug] Time-out connecting to debugging client, waited: 200 ms. Tried: localhost:9000 (through xdebug.client_host/xdebug.client_port) :-(

FILE: C:\Users\SI-001\Downloads\fontawesome_iconpicker\src\Plugin\Field\FieldFormatter\FontawesomeIconpicker.php
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FOUND 0 ERRORS AND 3 WARNINGS AFFECTING 3 LINES
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42 | WARNING | t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
43 | WARNING | t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
56 | WARNING | t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
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FILE: C:\Users\SI-001\Downloads\fontawesome_iconpicker\src\Plugin\Field\FieldWidget\FontawesomeIconpicker.php
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FOUND 0 ERRORS AND 8 WARNINGS AFFECTING 8 LINES
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42 | WARNING | t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
52 | WARNING | t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
53 | WARNING | t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
59 | WARNING | t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
61 | WARNING | t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
75 | WARNING | t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
79 | WARNING | t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
83 | WARNING | t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
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Time: 193ms; Memory: 6MB