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Updated the GTK3 import callback in setup.c to:
open a file chooser titled Import GTK3 Theme ZIP,
enforce a ZIP-focused chooser filter (*.zip, *.ZIP),
call the new backend function,
show success/failure dialogs through setup_theme_show_message,
refresh the GTK3 theme list immediately after successful import.
Updated the GTK3 section button label to Import GTK3 Theme ZIP and added/used new translatable strings for the new button text and import messages.