LightAdmin Internationalization (i18n)

[max-dev]

Currently, the only way to do it would be:

fragmentBuilder.field( "name" ).caption(messageSource.getMessage("Names") )

[agustisanchez]

I think adding a convenience method like captionKey(String key) would suffice.

public ... captionKey(String key){
   return caption(messageSource.getMessage(key);
}

[elwin013]

I've created pull request with changes (i18n for field captions, screen names, singular/plurar name and language switcher): #250