'Copy' translation is replaced by original string on loading

[adem4ik]

OS: Windows 10
Version: avidemux_2.8.2 r241110_win64.exe

1. Switch the language to Russian
2. Restart Avidemux

Result: For a while Copy is shown translated as Копировать. But it gets replaced by original after full loading of Avidemux.
Video: slowed by x2.5

P.S. It is an old bug, and I'm not sure where to post it. I guess it happens since this PR.

[JohnFowler58]

This problem also occurs when switching to Hungarian.