Adds documentation for the translation.

lang/Translation.md

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+Jitsi Meet Translation
+==========================
+Jitsi Meet uses [i18next](http://i18next.com) library for translation. 
+i18next uses separate json files for each language. 
+
+
+Translating Jitsi Meet
+======================
+The translation of Jitsi Meet is integrated with Pootle. You can translate Jitsi Meet via our Pootle user interface on 
+[http://translate.jitsi.org](http://translate.jitsi.org). 
+
+**WARNING: Please don't create or edit manually the language files! Please use our Pootle user interface!**
+
+Development
+===========
+If you want to add new functionality for Jitsi Meet and you have texts that need to be translated please use our translation module.
+It is located in modules/translation. You must add key and value in main.json file in English for each translatable text. 
+Than you can use the key to get the translated text for the current language.
+
+**WARNING: Please don't change the other language files except main.json! They must be updated and translated via our Pootle user interface!**
+
+You can add translatable text in the HTML:
+
+
+* **via attribute on HTML element** - add **data-i18n** attribute with value the key of the translatable text.
+
+
+ ```
+ <span data-i18n="dialog.OK">OK</span>
+ ```
+
+
+ You can also use APP.translation.generateTranslatonHTML(key, options) to get this HTML code as Javascript string.
+
+
+ ```
+ APP.translation.generateTranslatonHTML("dialog.OK") // returns <span data-i18n="dialog.OK">OK</span>
+ ```
+ 
+ The value in the options parameter will be added in data-i18n-options attribute of the element.
+ 
+ **Note:** If you dynamically add HTML elements don't forget to call APP.translation.translateElement(jquery_selector) to translate the text initially.
+
+* **via Javascript string** - call APP.translation.translateString(key, options). You can use that method to get the translated string in Javascript and then attach it in the HTML.
+ 
+ ```
+ APP.translation.translateString("dialog.OK") // returns the value for the key of the current language file. "OK" for example. 
+ ```
+
+For the available values of ``options`` parameter for the above methods of translation module see [i18next documentation](http://i18next.com/pages/doc_features).  
+
+**Note:** It is useful to add attributes in the HTML for persistent HTML elements because when the language is changed the text will be automatically translated.
+ Otherwise you should call ``APP.translation.translateString`` and manually change the text every time the language is changed.
+
+
+
+