I have created a website at: http://live.gaelic-translation.gotpantheon.com/.
Pantheon (https://www.getpantheon.com/) have very kindly offered to sponsor the initiative with the offer of hosting of the site.
If you have the ability to offer translations, please get in touch or go to the site and create a user account.
Once you have an account on the site, you need 2 things:
- to get a unique API key from http://localize.drupal.org that will allow you to send translations to the remote server
There is a link in the edit account page on that site that will take you to the API key, so that's straightforward enough.
- to apply to the translation team before you can commit translations back.
http://localize.drupal.org/translate/languages/gd
Click the link on that page to join the Scots Gaelic team.
With those in place all you do is browse around the various admin pages of the tranlator site and click translate at the bottom right hand corner of the site.
This brings up a pane that contains all the words on that page and translations can be offered for the words that don't have them yet.

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New URL
The URL for the translation site is now http://gaelic-translation.drupalscotland.org