From The Document Foundation Wiki
- You are encouraged to [$mailinglist subscribe to l10nglobal.libreoffice.org] mailing list. Apart from being a support channel for localizers, it's also the medium where important information for translators (such as string updates and deadlines) is announced. You can also ask 'timar' on irc.freenode.net in the #libreoffice-dev channel.
- You may edit new .ui files using Glade to see them in context. For that install Glade for your distribution (I only know for Linux, so fix it if you know for other distributions) and either a version from master or the last dev build you want to translate.
- then enter in your terminal: