Fix / correct Spanish translation

[giacomo (Giacomo Sanchietti)]

@jgjimenezs

where does this translation come from? “mié”

I guess it comes directly from the system, but I’m not sure.

@jgjimenezs

I managed to remove the scroll bar, edit the values of the header height: 48px, and the line-height: 16px to center the Title.

I really have no idea what modification you did. Can you please open a PR or at least cut&paste here a diff?