Create internationalization (i18n) translations

[daltondiaz]

Create i18n feature for future translations.

[myliang]

I haven’t thought about how to do it yet.

[xam4lor]

How about creating a folder with some files in it. When the user "load" the code on the index.html file, he passes a parameter called 'language' (default EN), and the code just load the corresponding file.

[xam4lor]

For example like the following structure :

In 'index.html' :

[...]
.loadData({
  language : 'EN'
})
[...]

And the code just check the file in src/language/EN.json and load it into a global constant object like 'LANGUAGE'.
To get a text, we just need to do a LANGUAGE.get(_id) to get the corresponding string.

[xam4lor]

Check my modification test.

[daltondiaz]

Check my modification test.

Its ok for me!

Create a PR!!

[xam4lor]

Done! Check #48.

[myliang]

wiki: https://github.com/myliang/x-spreadsheet/wiki/Internationalization