Form.php

<?php
/*
 +--------------------------------------------------------------------+
 | Copyright CiviCRM LLC. All rights reserved.                        |
 |                                                                    |
 | This work is published under the GNU AGPLv3 license with some      |
 | permitted exceptions and without any warranty. For full license    |
 | and copyright information, see https://civicrm.org/licensing       |
 +--------------------------------------------------------------------+
 */

/**
 *
 * @package CRM
 * @copyright CiviCRM LLC https://civicrm.org/licensing
 */
class CRM_Core_I18n_Form extends CRM_Core_Form {

  /**
   * List of available locales
   *
   * @var array
   * @internal
   */
  public $_locales = [];

  /**
   * Database structure of translatable columns
   *
   * @var array
   * @internal
   */
  public $_structure = [];

  public function buildQuickForm() {
    $config = CRM_Core_Config::singleton();
    $tsLocale = CRM_Core_I18n::getLocale();
    $this->_locales = array_keys($config->languageLimit);

    // get the part of the database we want to edit and validate it
    $table = CRM_Utils_Request::retrieve('table', 'String', $this);
    $field = CRM_Utils_Request::retrieve('field', 'String', $this);
    $id = CRM_Utils_Request::retrieve('id', 'Int', $this);
    $this->_structure = CRM_Core_I18n_SchemaStructure::columns();
    if (!isset($this->_structure[$table][$field])) {
      CRM_Core_Error::statusBounce("$table.$field is not internationalized.");
    }

    $this->addElement('hidden', 'table', $table);
    $this->addElement('hidden', 'field', $field);
    $this->addElement('hidden', 'id', $id);

    $cols = [];
    foreach ($this->_locales as $locale) {
      $cols[] = "{$field}_{$locale} {$locale}";
    }
    $query = 'SELECT ' . implode(', ', $cols) . " FROM $table WHERE id = $id";

    $dao = new CRM_Core_DAO();
    $dao->query($query, FALSE);
    $dao->fetch();

    // get html type and attributes for this field
    $widgets = CRM_Core_I18n_SchemaStructure::widgets();
    $widget = $widgets[$table][$field];

    // attributes
    $attributes = ['class' => ''];
    if (isset($widget['rows'])) {
      $attributes['rows'] = $widget['rows'];
    }
    if (isset($widget['cols'])) {
      $attributes['cols'] = $widget['cols'];
    }
    $required = !empty($widget['required']);

    if ($widget['type'] == 'RichTextEditor') {
      $widget['type'] = 'wysiwyg';
      $attributes['class'] = 'collapsed';
    }
    elseif ($widget['type'] == 'Text') {
      $attributes['class'] = 'huge';
    }

    $languages = CRM_Core_I18n::languages(TRUE);
    foreach ($this->_locales as $locale) {
      $attr = $attributes;
      $name = "{$field}_{$locale}";
      if ($locale == $tsLocale) {
        $attr['class'] .= ' default-lang';
      }
      $this->add($widget['type'], $name, $languages[$locale], $attr, $required);

      $this->_defaults[$name] = $dao->$locale;
    }

    $this->addDefaultButtons(ts('Save'), 'next', NULL);

    $this->setTitle(ts('Languages'));

    $this->assign('locales', $this->_locales);
    $this->assign('field', $field);
  }

  /**
   * This virtual function is used to set the default values of
   * various form elements
   *
   * access        public
   *
   * @return array
   *   reference to the array of default values
   */
  public function setDefaultValues() {
    return $this->_defaults;
  }

  public function postProcess() {
    $values = $this->exportValues();
    $table = $values['table'];
    $field = $values['field'];

    // validate table and field
    if (!isset($this->_structure[$table][$field])) {
      CRM_Core_Error::statusBounce("$table.$field is not internationalized.");
    }

    $cols = [];
    $params = [[$values['id'], 'Int']];
    $i = 1;
    foreach ($this->_locales as $locale) {
      $cols[] = "{$field}_{$locale} = %$i";
      $params[$i] = [$values["{$field}_{$locale}"], 'String'];
      $i++;
    }
    $query = "UPDATE $table SET " . implode(', ', $cols) . " WHERE id = %0";
    $dao = new CRM_Core_DAO();
    $query = CRM_Core_DAO::composeQuery($query, $params, TRUE);
    $dao->query($query, FALSE);
  }

}