Issue while installing social login application

I am not getting meaning of this step :
Add XWiki.SocialLoginTranslations as an internationalization bundle in your wiki administration (in section Localization)

This instruction is likely related to a very old behaviour of XWiki. This is not probably not needed anymore.
In any case, it sounds like this extension is not really maintained anymore, but I cannot really recommend you another one. You might want to check directly with the authors of the extension to see if they could maintain it.

@surli thanks for reply