The trans function translates the given translation key using your localization files:
<?php echo trans('messages.welcome');
<?php     protected function sendResetResponse(Request $request, $response)

    {

        if ($request->wantsJson()) {

            return new JsonResponse(['message' => trans($response)], 200);

        }



        return redirect($this->redirectPath())
<?php         }



        return redirect($this->redirectPath())

                            ->with('status', trans($response));

    }
<?php     {

        if ($request->wantsJson()) {

            throw ValidationException::withMessages([

                'email' => [trans($response)],

            ]);

        }
<?php         return redirect()->back()

                    ->withInput($request->only('email'))

                    ->withErrors(['email' => trans($response)]);

    }
<?php             : back();



        return $request->wantsJson()

            ? new JsonResponse(['message' => trans($response)], 200)

            : $redirect->with('status', trans($response));

    }
<?php         return $request->wantsJson()

            ? new JsonResponse(['message' => trans($response)], 200)

            : $redirect->with('status', trans($response));

    }
<?php         if ($request->wantsJson()) {

            throw ValidationException::withMessages([

                'email' => [trans($response)],

            ]);

        }
<?php         return $redirect

            ->withInput($request->only('email'))

            ->withErrors(['email' => trans($response)], 'user.forgot_password');

    }
<?php     protected function sendFailedLoginResponse(Request $request)

    {

        throw ValidationException::withMessages([

            $this->username() => [trans('auth.failed')],

        ]);

    }
<?php             $uris = $siblings->map->uri();



            if ($uris->contains($uri = $page->uri())) {

                throw ValidationException::withMessages(['uri' => trans('statamic::validation.duplicate_uri', ['value' => $uri])]);

            }

        }

    }
<?php             case 'outside_license_range':

                [$start, $end] = $this->response['range'];



                return trans('statamic::messages.licensing_error_outside_license_range', compact('start', 'end'));



            case 'invalid_edition':

                return trans('statamic::messages.licensing_error_invalid_edition', ['edition' => $this->response['edition']]);
<?php                 return trans('statamic::messages.licensing_error_outside_license_range', compact('start', 'end'));



            case 'invalid_edition':

                return trans('statamic::messages.licensing_error_invalid_edition', ['edition' => $this->response['edition']]);

        }



        return parent::invalidReason();
<?php             return;

        }



        return trans('statamic::messages.licensing_error_'.$reason);

    }

}
<?php     public function trans($value)

    {

        return trans($value);

    }
<?php         $this->assertEmpty(User::all());



        $this->artisan('statamic:make:user', ['email' => 'jason'])

            ->expectsOutput(trans('validation.email', ['attribute' => 'input']));



        $this->artisan('statamic:make:user', ['email' => 'jason@keeponrunnin.com'])

            ->expectsOutput('User created successfully.');