Link to “Plans and pricing” page at GitHub

To change the list of repos showing in "Repositories you contribute to" you'll need to change your commit behaviour.

The "Repositories you contribute to" side box lists repos you've forked or have push access to (that belong to other users or organisations) with these ordering factors (based on observation):

1. Recent activity by you or other users
2. Total commits authored by you

Or you can add a browser extension, like Greasemonkey, that would target and blank that section/block via CSS or other targeting rule.

You can't otherwise customise or remove the box.

The list of watched repositories can be found under Watched Repositories, which shows as a tab after you click through to Notifications.

Thanks to the Internet Archive Wayback Machine, this is what the footer used to look like when they had the translation options circa late 2010:

A redesign or two since then has removed the footer, and that the URL parameters have no effect, it's looking like that feature has been quietly deprecated from the GitHub web interface.

Also, you can't load SSL pages via Google Translate or Bing Translate, so using those to filter the page in a non-English language will unfortunately not work.

Unless there is another service that will translate SSL delivered pages (all of github.com is served over SSL), you can't live render a local translation of github.com to read.