* MSG_002 doesn't display in RTL
* Update Policy dialog loses RTL setting after the first paragraph
* Some text displayed in native Windows message boxes is not using RTL
(even as the Message Box itself will display the rest of the UI elements as RTL)
* Detect if the relevant language pack is installed and use MessageBoxEx to
display native message box buttons using the selected language.
* All theses issues are part of #621
* Also remove trailing whitespaces