/usr/share/applications/unity-region-panel.desktop is in unity-control-center 15.04.0+16.04.20160413-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | [Desktop Entry]
Name=Text Entry
Comment=Change your keyboard or input method settings
Exec=unity-control-center region
Icon=preferences-desktop-keyboard-shortcuts
Terminal=false
Type=Application
StartupNotify=true
Categories=GNOME;GTK;Settings;DesktopSettings;X-Unity-Settings-Panel;X-GNOME-PersonalSettings
OnlyShowIn=Unity;
X-Unity-Settings-Panel=region
# Translators: those are keywords for the region control-center panel
Keywords=Language;Layout;Keyboard;Input Method;Text Entry;
X-Ubuntu-Gettext-Domain=unity-control-center
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