For multi-language websites, it usually gets difficult to manage the translations if the website is updated frequently and/or there are multiple translators.

String is a totally free and web-based platform for managing the language files of multi-language websites.

It enables you to import languages files (almost in any format) or start a project from scratch and start translating the strings.

You can invite any number of users and let them help you with the translation process by controlling the user-based read/write permissions.

Once the translation is complete, simply export the language-files (PHP -array, define-, Yaml, .INI, .strings -for iPhone-, Po) and that's all.

The application has a very easy-to-use interface with features like "the ability to see revisions" or "commenting for each string" and much more.

Google AJAX Translation API is a library for translating words or sentences from one language to another using Google Translate database.

Check this example:

google.language.translate(‘Beaucoup’, ‘fr’, ‘en’, function(result) {
  alert(result.translation);
});

This Google AJAX Translation API example simply translates "Beaucoup" from French to English.

A great feature of the API is getting the language of the input and best of all the accuracy ratio of the results.

Languages supported are limited with the ones in the Google Translate service.