docs: refine welcome message wording in contribution guide

Chinese version:
- Change '赞赏' to '欣赏' for more natural expression
- Remove '和领导者' to simplify the welcome message

English version:
- Remove 'and leaders' to match Chinese version simplification

These changes make the welcome message more concise and natural
in both language versions.

Author: jiaoshuntian

CN/modules/ROOT/pages/master/contribution/contribution_guide.adoc

@@ -11,11 +11,11 @@
 
 IvorySQL由一个核心开发团队维护，该团队拥有对GitHub上的IvorySQL主存储库的提交权限。同时，我们非常渴望从更广泛的IvorySQL社区中的成员那里获得贡献。如果您希望看到您的代码或文档更改被添加到IvorySQL并出现在将来的版本中，本节的内容介绍是您需要知道的。
 
-​IvorySQL社区欢迎并赞赏所有类型的贡献，期待您的加入！
+​IvorySQL社区欢迎并欣赏所有类型的贡献，期待您的加入！
 
 === 行为准则
 
-我们欢迎所有社区成员、贡献者和领导者阅读并遵守我们的 https://github.com/IvorySQL/IvorySQL/blob/master/CODE_OF_CONDUCT_CN.md[*行为准则*]。我们致力于为每个人创造包容、尊重的参与环境，不论其背景或身份特征如何。行为准则明确了我们对社区行为的期望，确保所有参与者都能在无骚扰的环境中合作。
+我们欢迎所有社区成员、贡献者阅读并遵守我们的 https://github.com/IvorySQL/IvorySQL/blob/master/CODE_OF_CONDUCT_CN.md[*行为准则*]。我们致力于为每个人创造包容、尊重的参与环境，不论其背景或身份特征如何。行为准则明确了我们对社区行为的期望，确保所有参与者都能在无骚扰的环境中合作。
 
 === 管理说明
 

EN/modules/ROOT/pages/master/contribution/contribution_guide.adoc

@@ -15,7 +15,7 @@ The IvorySQL community welcomes and appreciates all types of contributions, and
 
 === Code of Conduct
 
-We welcome all community members, contributors, and leaders to read and follow our https://github.com/IvorySQL/IvorySQL/blob/master/CODE_OF_CONDUCT.md[*Code of Conduct*]. We are committed to creating an inclusive and respectful participation environment for everyone, regardless of their background or identity characteristics. The Code of Conduct clarifies our expectations for community behavior, ensuring that all participants can collaborate in a harassment-free environment.
+We welcome all community members and contributors to read and follow our https://github.com/IvorySQL/IvorySQL/blob/master/CODE_OF_CONDUCT.md[*Code of Conduct*]. We are committed to creating an inclusive and respectful participation environment for everyone, regardless of their background or identity characteristics. The Code of Conduct clarifies our expectations for community behavior, ensuring that all participants can collaborate in a harassment-free environment.
 
 === Governance