I have noticed there is no Czech language available in the list of languages for Social Login plugin. As I have a long-time experience in translating different projects, I'm willing to provide you a Czech translation of all the required strings.
If you are interested please send me a POT file or simple list with all strings used in your plugin and API.
I have sent you an email with Czech translations on April 23. Did you get it? I'm asking since the Czech language is still not available in the list of languages.
Thanks for your reply.