i18n for the edit label

[Mateus Machado Luna]

Hi, thank you for the simple and efficient plugin!

I have a question/request. I'm not sure how complicated would it be to implement this, but could it be possible to set the label for different languages of the documentation? For example:

EditOnGithubPlugin.create(
    docBase, 
    docEditBase, 
    title: {
        '/': 'Edit on Github',
        '/pt-br': 'Editar no Github'
    }
)

[Leon Zhang]

I will try to support later.

[Leon Zhang]

supported in eb35065, refer to readme