translate: Change translate for admin.config.enable_captcha (go-gitea#11657)

* translate: Change translate for admin.config.enable_captcha

add 'register' to make it more accurate

Signed-off-by: a1012112796 <1012112796@qq.com>

* Update options/locale/locale_en-US.ini

Co-authored-by: Cirno the Strongest <1447794+CirnoT@users.noreply.github.com>

Co-authored-by: Cirno the Strongest <1447794+CirnoT@users.noreply.github.com>
Co-authored-by: Lauris BH <lauris@nix.lv>

Author: 3 people

options/locale/locale_en-US.ini

@@ -166,7 +166,7 @@ openid_signin = Enable OpenID Sign-In
 openid_signin_popup = Enable user sign-in via OpenID.
 openid_signup = Enable OpenID Self-Registration
 openid_signup_popup = Enable OpenID-based user self-registration.
-enable_captcha = Enable CAPTCHA
+enable_captcha = Enable registration CAPTCHA
 enable_captcha_popup = Require a CAPTCHA for user self-registration.
 require_sign_in_view = Require Sign-In to View Pages
 require_sign_in_view_popup = Limit page access to signed-in users. Visitors will only see the 'sign in' and registration pages.