Ensure that at least the default regexp for external link url matching is present.

If one has a custom config file and does not have the new link_url matcher yet, the admin view throws a javascript exception.

Conflicts:
	app/views/layouts/alchemy/admin.html.erb
Show page language in locked page tab.

Also updates the language symbol style.
Split the tinymce initialization into a global and a custom "per page" part.

This splits up the TinyMCE configuration into a global part, that gets evaluated on every full page load and a custom part, where only these custom tinymces get initialized that needs to be on that particular page.

Hopefully closes #500, closes #531 and closes #536

Conflicts:
	app/views/alchemy/admin/pages/_tinymce_config.html.erb
	app/views/alchemy/admin/pages/edit.html.erb
Set the current Alchemy javascript locale on every request.

This ensures that switching the locale is also represented in javascript translations.