Pootle is an online translation and localization tool. It tries to lower the barrier of entry, but also provides tools to enable teams to work towards higher quality while welcoming newcomers.
Pootle is a Server
Pootle is written in Python using the Django framework and therefore can be installed on any web server that supports serving WSGI applications.
A number of translation projects for a number of languages can be hosted on Pootle. It allows a team to manage their files, permissions, projects, and also allows for translation on-line. Files can be downloaded for offline translation and later uploaded again.
Installation can be done via pip:
pip install pootle
But don't forget to read the quickstart guide for the important details.
Pootle is released under the General Public License, version 2 or later. See the file LICENSE for details.