Revert text change

Author: Kamil Daniel

Sources/KeyboardShortcuts/Localization/en.lproj/Localizable.strings

@@ -2,7 +2,7 @@
 "press_shortcut" = "Press Shortcut";
 "keyboard_shortcut_used_by_other_action" = "This keyboard shortcut is already assigned to another action."
 "keyboard_shortcut_used_by_menu_item" = "This keyboard shortcut cannot be used as it’s already used by the “%@” menu item.";
-"keyboard_shortcut_used_by_system" = "This keyboard shortcut cannot be used as it’s already a system-wide keyboard shortcut2.";
+"keyboard_shortcut_used_by_system" = "This keyboard shortcut cannot be used as it’s already a system-wide keyboard shortcut.";
 "keyboard_shortcuts_can_be_changed" = "Most system-wide keyboard shortcuts can be changed in “System Settings › Keyboard › Keyboard Shortcuts”.";
 "keyboard_shortcut_disallowed" = "Option modifier must be combined with Command or Control.";
 "force_use_shortcut" = "Use Anyway";