Translation helper program: add support for merging un-tabbed language files

What I really need is a whitespace-agnostic Replace() function, but in
lieu of that, this will work for now.
Malay translation: first build

Courtesy of Google Translate.
Swedish translation: first build

Courtesy of Google Translate.
Update language files against latest 6.4 build
Plugin Manager: fix font size on OK / Cancel buttons
About dialog: add speed up / slow down / pause buttons

Just a bit o' fun.