[1.2.5] ChangeLogs: several changes

docs/guide/ChangeLog_v1.2.5.md

@@ -1,4 +1,16 @@
+# Mogan STEM Suite v1.2.5 LTS
+Mogan STEM Suite v1.2.5 LTS:
++ Mogan Research v1.2.5 LTS
+
 ## Detailed changes that affect users
 + Installers
   + official deb installer for Ubuntu 20.04
   + portable installer for Windows 10/11
++ Performance Improvements
+  + Improve the speed of parsing TeXmacs documents
+  + Improve the speed of rendering Pine beamer theme
++ Shortcuts
+  + macOS: Command +/- with/without shift to zoom in/out
++ Layout Engine
+  + Fix the region invalidation issue when deleting
+  + Fix failure when setting the columns number of the specific content to 2 in beamer mode

docs/zh/guide/ChangeLog_v1.2.5.md

@@ -1,4 +1,16 @@
+# 墨干理工套件V1.2.5LTS
+墨干理工套件V1.2.5LTS包含以下组件：
++ 墨干V1.2.5LTS (Mogan Research v1.2.5 LTS)
+
 ## 影响用户体验的详细更新
 + 安装包
   + 提供Ubuntu 20.04的deb安装包
   + 提供Windows平台的便携版安装包
++ 性能优化
+  + 改进解析TeXmacs文档的性能
+  + 改进渲染Pine幻灯片主题的性能
++ 快捷键
+  + macOS：Command和+/-的组合无论是否按下Shift都可以放大或者缩小
++ 排版引擎
+  + 修复在文档中删除内容出现残影的问题
+  + 修复在幻灯片设置部分内容为双栏时出错的问题