* Method to get the translation for a message.
 * 
 * Example:
 * Translator::get('Translate me');
 * Translator::get('Translate :placeholder', array(':placeholder' => 'me'));
 * Translator::get('scope', 'Translate me');
* Translator::get('scope', 'Translate :placeholder', array(':placeholder' => 'me'));
* Method to get the translation for a message.
 * 
 * Example:
 * Translator::get('Translate me');
 * Translator::get('Translate :placeholder', array(':placeholder' => 'me'));
 * Translator::get('scope', 'Translate me');
* Translator::get('scope', 'Translate :placeholder', array(':placeholder' => 'me'));