Laravel 5.4 field Validation already exists

I have a field called title in table languages.

While creating a new user using register form, user has a option to either chose existing or create a new language. How do I make sure the language created is unique?

users table is different and languages table is different.

my current validation code in create method (Registercontroller)

            'firstname' => 'required|max:255',
            'lastname' => 'required|max:255',
            'email' => ['required','max:255','unique:users','regex:/(@org.uk)$/',],
            'password' => 'required|min:6|confirmed',
            'title' => 'required',

I want to add something like: unqiue:languages but how do I do that? do I set langauge field to unique?

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