Loco is a Translation Management System aimed primarily at developers. It’s been online since 2012 and has since become my full time job.
I originally had the idea for Loco around 2004 while working at a marketing agency. The process by which multi-language copy was translated, approved, and integrated was laborious and extremely error prone. Generally it involved emailing spreadsheets back and forth. Version control was non-existent and developer integration was a very manual workflow.
In the years that followed I worked at numerous other agencies and found the same problem existed everywhere I went. Eventually I built an online tool to manage translation workflow from a developer perspective. Today it has thousands of users.
Try it out, it’s free. https://localise.biz/.
There is also a WordPress plugin that can be used without a Loco account.