优化，减少可能到来的1.2.4的工作量

1.增加翻译
2.为darkmode添加过度动画
3.修改package.json

src/js/components/MessageInput/index.js

@@ -29,7 +29,7 @@ export default class MessageInput extends Component {
             && user.length === 1
             && user.slice(-1).pop().UserName === this.props.me.UserName
         ) {
-            this.props.showMessage('Can\'t send messages to yourself.');
+            this.props.showMessage('不能向自己发送消息');
             return false;
         }
 
@@ -62,7 +62,7 @@ export default class MessageInput extends Component {
                     );
 
                     if (!res) {
-                        await this.props.showMessage(batch ? `Sending message to ${e.NickName} has failed!` : 'Failed to send message.');
+                        await this.props.showMessage(batch ? `Sending message to ${e.NickName} has failed!` : '消息发送失败');
                     }
 
                     return true;
@@ -114,7 +114,7 @@ export default class MessageInput extends Component {
                     continue;
                 }
                 // In batch mode just show the failed message
-                showMessage('Failed to send image.');
+                showMessage('发送图片失败');
             }
         }
     }