Localization professional and developer here. I'd recommend taking a look at Transifex. This is a well thought out tool for managing localization projects and assets (prompt catalogs, resx files, etc), and for managing the translation process (it supports machine, crowd and professional translation, so you can optimize for cost and quality).<p>They also just released a really neat Javascript tool which makes translating web content super easy. You just embed some JS in your template, and it re-writes the pages in translation when needed. Way way easier than, for example, setting up a multilingual Drupal site, and in most cases, will get the job done nicely.<p>My $0.02