Catch STRG + S in TinyMCE on resource-editing-page and trigger the MODX save-method instead

[JensWolff]

If you press STRG + S for saving on the resource-editing-page, you can save the actual changes. This also works if your focus is on any textbox-element of the editing-page - but not on the TinyMCE. If you have focused the editor and press STRG + S the browser tries to save the page to the HDD instead of triggering the MODX Manager-Save-Method.
I don't know if it is possible to catch that call, but perhaps somebody has an idea how to handle that.