If UDL dialog is docked and we change localization file then button Dock/Undock has Dock label instead of Undock.

STR:

1. Open Notepad++
2. Open UDL dialog (Language-->User Defined Language-->Define your language...) and dock it (press Dock button)
3. Change localization in Preferences (even once again to English)

A docked UDL dialog will have the label Dock instead of Undock on the toggle button.

Notepad++ v8.4.9   (64-bit)
Build time : Feb 25 2023 - 02:10:07
Built with : GCC 12.2.0
Path : D:\WebTools\GitHub\NPP\PowerEditor\gcc\bin.x86_64\notepad++.exe
Command Line : -multiInst
Admin mode : OFF
Local Conf mode : ON
Cloud Config : OFF
OS Name : W (64-bit)
OS Version : 21H2
OS Build : 22000.1574
Current ANSI codepage : 1250
Plugins : none