Very basic Golang library for i18n. There are others that do the job, but this is my take on the problem.

1. Storing messages in JSON files.
2. Support for nested declarations.
3. Detecting language based on Request headers.
4. Very simple to use.

1. Import Lingo into your project

     import "github.com/kortem/lingo"

2. Create a dir to store translations, and write them in JSON files named [locale].json. For example:

     en_US.json
     sr_RS.json
     de.json
     ...
   

   You can write nested JSON too.

     {
       "main.title" : "CutleryPlus",
       "main.subtitle" : "Knives that put cut in cutlery.",
       "menu" : {
         "home" : "Home",
         "products": {
           "self": "Products",
           "forks" : "Forks",
           "knives" : "Knives",
           "spoons" : "Spoons"
         },
       }
     }

3. Initialize a Lingo like this:

     l := lingo.New("default_locale", "path/to/translations/dir")

4. Get bundle for specific locale via either string:

     t1 := l.TranslationsForLocale("en_US")
     t2 := l.TranslationsForLocale("de_DE")

   This way Lingo will return the bundle for specific locale, or default if given is not found. Alternatively (or primarily), you can get it with *http.Request:

     t := l.TranslationsForRequest(req)

   This way Lingo finds best suited locale via Accept-Language header, or if there is no match, returns default. Accept-Language header is set by the browser, so basically it will serve the language the user has set to his browser.

5. Once you get T instance just fire away!

     r1 := t1.Value("main.subtitle")
     // "Knives that put cut in cutlery."
     r1 := t2.Value("main.subtitle")
     // "Messer, die legte in Besteck geschnitten."
   	r3 := t1.Value("menu.products.self")
     // "Products"
     r5 := t1.Value("error.404", req.URL.Path)
     // "Page idnex.html not found!"

1. Feature to allow you to get T of specific segment in JSON, and not just string values. That way you can group specific messages and extract only that segment where you need it, of different views and/or components.
2. Create a tool to keep all .json files in sync.
3. Provide http.HandlerFunc that serves web pages for easy translations management.

I am a gopher newb, been hacking around for a couple of months in my spare time, so any comment/contrubution is welcome. That said, use at your own risk. :D