Author: Jeff Webster
MDL-48501 lang: update reCAPTCHA language strings
http://git.moodle.org/gw?p=moodle.git;a=commit;h=c692bb567fe379104fa349c732c99ab1f530ada2
http://github.com/moodle/moodle/commit/c692bb567fe379104fa349c732c99ab1f530ada2
+ 3.1 en [configrecaptchaprivatekey,core_admin]
+ 3.1 en [configrecaptchapublickey,core_admin]
+ 3.1 en [recaptcha_help,core_auth]
+ 3.1 en [missingrecaptchachallengefield,core]