the second argument of t() is expected to be an array

```php
	/**
	 * @brief Translating
	 * @param string $text The text we need a translation for
	 * @param array $parameters default:array() Parameters for sprintf
	 * @return \OC_L10N_String Translation or the same text
	 *
	 * Returns the translation. If no translation is found, $text will be
	 * returned.
	 */
	public function t($text, $parameters = array()) {
		return new OC_L10N_String($this, $text, $parameters);
	}

```