Patch by taos to add localized catalog for the Keymaps Modifier keys window.

Due to a missing entry in Keymap's Jamfile, the localized strings of
ModifierKeysWindow.cpp are not yet included in the corresponding catalog
on HTA.

The attached patch adds ModifierKeysWindow.cpp to DoCatalogs and changes 'Ok' to 'OK'.

Fixes #8127

src/preferences/keymap/ModifierKeysWindow.cpp

@@ -81,7 +81,7 @@ ModifierKeysWindow::ModifierKeysWindow()
 		new BMessage(kMsgRevertModifiers));
 	fRevertButton->SetEnabled(false);
 
-	fOkButton = new BButton("OkButton", B_TRANSLATE("Ok"),
+	fOkButton = new BButton("OkButton", B_TRANSLATE("OK"),
 		new BMessage(kMsgApplyModifiers));
 	fOkButton->MakeDefault(true);