Finish the localization of the application
issue #37: adding jqplot to credits file
removing personal copyright notice from footer (thanks for all the
contributions guys, its "our" project now)
Merge pull request #39 from Lauraly-com/localize

Finish the localization of the application
issue #39: changing language files to represent their respective
locales, change date format to use strftime(%x %X), making %e usage
windows compatible, and fixing yesterday_format and other_format,
updating language filename in README