Updated all language files.
All localization related stuff has now moved to http://crowdin.net/project/schematica - if you'd like to contribute translations, please do so at crowdin.net (it's user friendlier, no encoding issues).
Translation credits up to date can be found in the commit history, the files will no longer contain author/contributor information (it can be all found at crowdin.net).
Added Thai localization file.