en to unknown language translation catalogue (4 entries)

[ctx: qpdfview::BookmarkMenu]
en: &Open
target: &Очиш

[ctx: qpdfview::BookmarkMenu]
en: &Remove bookmark
target: Хатчўпни &ўчириш

[ctx: qpdfview::BookmarkMenu]
en: Open in new &tab
target: Янги &табда очиш

[ctx: qpdfview::MainWindow]
en: &Remove bookmark
target: Хатчўпни &ўчириш
