Few strings not localised yet

[Briseur]

Here are few strings missing localisation.
(There are not in catkeys file so can't be translated.)
In about window, "All rights reserved" & "Special Thanks:"
In main window, in bottom left corner "Text File" and I guess whatever filetype is.

That's all I found.

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[KapiX]

The strings you mention in About window are from Haiku:
https://github.com/haiku/haiku/blob/d87eeceea5d64289678d5796bf528b7844937ac0/src/kits/interface/AboutWindow.cpp#L502
https://github.com/haiku/haiku/blob/d87eeceea5d64289678d5796bf528b7844937ac0/src/kits/interface/AboutWindow.cpp#L530

File types are not translated yet, indeed. They are loaded from YAML files, so making them localizable needs a bit more thought.