Allow empty strings for translations

[gcko]

Currently if I was to define the following:

{
  key: ''
}

and called it:

i18n.t('key')

I would be returned 'key'

I find it useful to allow empty strings as proper values in the case where I recieve a list of status messages from the backend that are more verbose than what I want on the client.

For instance if the server provides three states for a notification: ['new','seen','done'], i may want the translation to look like this:

{
  notifications: {
    new: 'New'
    seen: ''
    done: ''
  }
}

so a call to i18n.t('notifications.seen') would return ""

[gcko]

Closing as the merge looks fine