Fix casing in English translation

conf/locale/locale_en-US.ini

@@ -930,7 +930,7 @@ config.db_ssl_mode_helper = (for "postgres" only)
 config.db_path = Path
 config.db_path_helper = (for "sqlite3" and "tidb")
 config.service_config = Service Configuration
-config.register_email_confirm = Require email confirmation
+config.register_email_confirm = Require Email Confirmation
 config.disable_register = Disable Registration
 config.show_registration_button = Show Register Button
 config.require_sign_in_view = Require Sign In View