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diff --git a/services/activity-spec/swagger-ui/lang/translator.js b/services/activity-spec/swagger-ui/lang/translator.js
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+++ b/services/activity-spec/swagger-ui/lang/translator.js
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+'use strict';
+
+/**
+ * Translator for documentation pages.
+ *
+ * To enable translation you should include one of language-files in your index.html
+ * after <script src='lang/translator.js' type='text/javascript'></script>.
+ * For example - <script src='lang/ru.js' type='text/javascript'></script>
+ *
+ * If you wish to translate some new texsts you should do two things:
+ * 1. Add a new phrase pair ("New Phrase": "New Translation") into your language file (for example lang/ru.js). It will be great if you add it in other language files too.
+ * 2. Mark that text it templates this way <anyHtmlTag data-sw-translate>New Phrase</anyHtmlTag> or <anyHtmlTag data-sw-translate value='New Phrase'/>.
+ * The main thing here is attribute data-sw-translate. Only inner html, title-attribute and value-attribute are going to translate.
+ *
+ */
+window.SwaggerTranslator = {
+
+    _words:[],
+
+    translate: function(sel) {
+      var $this = this;
+      sel = sel || '[data-sw-translate]';
+
+      $(sel).each(function() {
+        $(this).html($this._tryTranslate($(this).html()));
+
+        $(this).val($this._tryTranslate($(this).val()));
+        $(this).attr('title', $this._tryTranslate($(this).attr('title')));
+      });
+    },
+
+    _tryTranslate: function(word) {
+      return this._words[$.trim(word)] !== undefined ? this._words[$.trim(word)] : word;
+    },
+
+    learn: function(wordsMap) {
+      this._words = wordsMap;
+    }
+};