Captcha支持配置按钮文案

[moyus]

• Mand Mobile Version
  1.2.3

• OS Version & Browser Version
  略

• Node Version, Package Management Tool(such as npm/cnpm/yarn) & Version for building errors
  略

• Recurring Links
  略

• Recurring Steps
  略

• Expectant Behaviors
  可配置发送验证码按钮的不同状态的文案

• Actual Behaviors
  按钮文案固定无法修改