Change Footer display description (do translation)

[Yurii-huang]

Implement code:

class IFooter(Footer):
    def _make_key_text(self) -> Text:
          ......
 
          key_text = Text.assemble(
                (f"<{key_display}>", highlight_key_style if hovered else key_style),
                (
                    f" {_(binding.description)} ", # do translation
                    highlight_style if hovered else base_style + description_style,
                ),
                meta={
                    "@click": f"app.check_bindings('{binding.key}')",
                    "key": binding.key,
                },
            )

    def render(self) -> RenderableType:
        if self._key_text is None:
            self._key_text = self._make_key_text()
        return self._key_text