Language of reCaptcha should be set to the same language as phpMyAdmin - just try to change language on login page, reCaptcha is still displayed with language of your browser.
Fixed with https://github.com/phpmyadmin/phpmyadmin/commit/6a7d3f9ed77e3923e1c8e90bd57b1be4c6f759c4
Fixed with https://github.com/phpmyadmin/phpmyadmin/commit/6a7d3f9ed77e3923e1c8e90bd57b1be4c6f759c4