This is not the right way to do i18n. Banners are difficult and buggy
with translations, the folder structure is wrong and the result is
duplicated markup.

For the sake of maintainability, I am liberally removing this from core.
Future i18n attempts should use real gettext implementations and
possibly seperate i18n files from core as an extension.

Because Cupkle contributed the Catalan translation, this also removes
him/her from contributors.

The <header> element represents a group of introductory or navigational
aids. It is semantically incorrect to use it with only one element
inside.

The <header> element was introduced in commit 87014fa08f. That commit
describes the correct usage of <header> element with multiple elements
inside <header>.

This bug was introduced in commit fd566d3d7f.