diff --git a/build/controllers/TranslationController.php b/build/controllers/TranslationController.php
new file mode 100644
index 00000000000..a369b8a0b14
--- /dev/null
+++ b/build/controllers/TranslationController.php
@@ -0,0 +1,145 @@
+<?php
+/**
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\build\controllers;
+
+use DirectoryIterator;
+use Yii;
+use yii\console\Controller;
+use yii\helpers\Html;
+
+/**
+ * TranslationController handles tasks related to framework translations.
+ *
+ * build translation ../docs/guide" "../docs/guide_ru" --title="Russian guide translation report" > report_guide_ru.html
+ *
+ * @author Alexander Makarov <sam@rmcreative.ru>
+ */
+class TranslationController extends Controller
+{
+    public $defaultAction = 'report';
+
+    /**
+     * Creates a report about documentation updates since last update of same named translations.
+     *
+     * @param string $sourcePath the directory where the original documentation files are
+     * @param string $translationPath the directory where the translated documentation files are
+     * @param string $title custom title to use for report
+     * @return string
+     */
+    public function actionReport($sourcePath, $translationPath, $title = 'Translation report')
+    {
+        $sourcePath = trim($sourcePath, '/\\');
+        $translationPath = trim($translationPath, '/\\');
+
+        $results = [];
+
+        $dir = new DirectoryIterator($sourcePath);
+        foreach ($dir as $fileinfo) {
+            /** @var DirectoryIterator $fileinfo */
+            if (!$fileinfo->isDot() && !$fileinfo->isDir()) {
+                $translatedFilePath = $translationPath . '/' . $fileinfo->getFilename();
+                $sourceFilePath = $sourcePath . '/' . $fileinfo->getFilename();
+
+                $errors = $this->checkFiles($translatedFilePath);
+                $diff = empty($errors) ? $this->getDiff($translatedFilePath, $sourceFilePath) : '';
+                if(!empty($diff)) {
+                    $errors[] = 'Translation outdated.';
+                }
+
+                $result = [
+                    'errors' => $errors,
+                    'diff' => $diff,
+                ];
+
+                $results[$fileinfo->getFilename()] = $result;
+            }
+        }
+
+        // checking if there are obsolete translation files
+        $dir = new DirectoryIterator($translationPath);
+        foreach ($dir as $fileinfo) {
+            /** @var \DirectoryIterator $fileinfo */
+            if (!$fileinfo->isDot() && !$fileinfo->isDir()) {
+                $translatedFilePath = $translationPath . '/' . $fileinfo->getFilename();
+
+                $errors = $this->checkFiles(null, $translatedFilePath);
+                if(!empty($errors)) {
+                    $results[$fileinfo->getFilename()]['errors'] = $errors;
+                }
+            }
+        }
+
+        echo $this->renderFile(__DIR__ . '/views/translation/report_html.php', [
+            'results' => $results,
+            'sourcePath' => $sourcePath,
+            'translationPath' => $translationPath,
+            'title' => $title,
+        ]);
+    }
+
+    /**
+     * Checks for files existence
+     *
+     * @param string $translatedFilePath
+     * @param string $sourceFilePath
+     * @return array errors
+     */
+    protected function checkFiles($translatedFilePath = null, $sourceFilePath = null)
+    {
+        $errors = [];
+        if ($translatedFilePath !== null && !file_exists($translatedFilePath)) {
+            $errors[] = 'Translation does not exist.';
+        }
+
+        if ($sourceFilePath !== null && !file_exists($sourceFilePath)) {
+            $errors[] = 'Source does not exist.';
+        }
+
+        return $errors;
+    }
+
+    /**
+     * Getting DIFF from git
+     *
+     * @param string $translatedFilePath path pointing to translated file
+     * @param string $sourceFilePath path pointing to original file
+     * @return string DIFF
+     */
+    protected function getDiff($translatedFilePath, $sourceFilePath)
+    {
+        $lastTranslationHash = shell_exec('git log -1 --format=format:"%H" -- ' . $translatedFilePath);
+        return shell_exec('git diff ' . $lastTranslationHash.'..HEAD -- ' . $sourceFilePath);
+    }
+
+    /**
+     * Adds all necessary HTML tags and classes to diff output
+     *
+     * @param string $diff DIFF
+     * @return string highlighted DIFF
+     */
+    protected function highlightDiff($diff)
+    {
+        $lines = explode("\n", $diff);
+        foreach ($lines as $key => $val) {
+            if (mb_substr($val, 0, 1, 'utf-8') === '@') {
+                $lines[$key] = '<span class="info">' . Html::encode($val) . '</span>';
+            }
+            else if (mb_substr($val, 0, 1, 'utf-8') === '+') {
+                $lines[$key] = '<ins>' . Html::encode($val) . '</ins>';
+            }
+            else if (mb_substr($val, 0, 1, 'utf-8') === '-') {
+                $lines[$key] = '<del>' . Html::encode($val) . '</del>';
+            }
+            else {
+                $lines[$key] = Html::encode($val);
+            }
+        }
+
+        return implode("\n", $lines);
+    }
+}
diff --git a/build/controllers/views/translation/report_html.php b/build/controllers/views/translation/report_html.php
new file mode 100644
index 00000000000..e3e48affcfc
--- /dev/null
+++ b/build/controllers/views/translation/report_html.php
@@ -0,0 +1,47 @@
+<?php
+use yii\helpers\Html;
+?><!doctype html>
+<html>
+    <head>
+        <meta charset="utf-8" />
+        <title>Translation report</title>
+
+        <style>
+            .diff ins {
+                background: #cfc;
+                text-decoration: none;
+            }
+
+            .diff del {
+                background: #ffe6cc;
+                text-decoration: none;
+            }
+
+            .ok {
+                color: #99cc32;
+            }
+
+            .errors {
+                color: #cc5129;
+            }
+        </style>
+    </head>
+    <body>
+        <h1><?php echo Html::encode($title)?></h1>
+
+        <ul>
+            <li><strong>Source:</strong> <?php echo Html::encode($sourcePath)?></li>
+            <li><strong>Translation:</strong> <?php echo Html::encode($translationPath)?></li>
+        </ul>
+
+        <?php foreach($results as $name => $result):?>
+            <h2 class="<?php echo empty($result['errors']) ? 'ok' : 'errors'?>"><?php echo $name?></h2>
+            <?php foreach($result['errors'] as $error):?>
+                <p><?php echo Html::encode($error)?></p>
+            <?php endforeach ?>
+            <?php if(!empty($result['diff'])):?>
+                <code class="diff"><pre><?php echo $this->highlightDiff($result['diff'])?></pre></code>
+            <?php endif?>
+        <?php endforeach ?>
+    </body>
+</html>
\ No newline at end of file