[BUG] Keyboard shortcuts stop working when using non-US keyboard layouts

[tattdogg]

Steps to reproduce:
Set your system keyboard layout to US.
Open COSMIC Text Editor and type any text.
Press Ctrl+A → all text is selected (works).
Press Ctrl+C → text is copied (works).
Press Ctrl+V → text is pasted (works).
Switch the system keyboard layout to any non-US layout (tested with Russian — RU).
Try the same shortcuts again:
Ctrl+A
Ctrl+C
Ctrl+V

Actual result:
None of the standard keyboard shortcuts work when a non-US keyboard layout is active.

Expected result:
Shortcuts like Ctrl+A, Ctrl+C, Ctrl+V, Ctrl+Z, Ctrl+S, etc. should work regardless of the active keyboard layout.

Additional info:
I also noticed that context menu commands (right mouse click) do not work as well with non-US layout