Incorrect default keybinding for zoom in on some non-English keyboard layouts

The keybinding/output of gsettings get org.gnome.desktop.input-sources mru-sources return on first position of the array:

1. ('xkb', 'us+intl')zoom in mapped to =, zoom out mapped to -.
2. ('xkb', 'us') Idem.
3. ('xkb', 'de')zoom in mapped to 0, zoom out mapped to -.
4. ('xkb', 'es')zoom in mapped to 0, zoom out mapped to -.

That is, zoom in in English is mapped to what using Shift is a +.

On some non-English keyboards zoom out is correctly mapped to -, but zoom in is by default mapped to 0, which doesn't make any sense. Instead, should be mapped to +.

With 'fr' the keybinding seems correct, with - qnd = (+ with Shift)

Beside all this hassle we all happily have a + and a - key on the numeric pad that inexplicably is not currently being used. I wonder if I need to file another issue for this or could be considered on the scope of this one.