Problem: I have a session in few days, and my language's localization is not complete. I have already contributed new strings, but too late for them being included in time in a new release.

Solution: it is easy to provide additional localization strings in Django. Just follow these steps:

1. Inside your project root, create a locale/LANG/LC_MESSAGES folder, replacing LANG with your language code (e.g. it for Italian).
2. Download the strings file (django.po) in the desired language to that folder. If your language is not supported, download another one.
3. Edit the file with poedit or with a simple text editor. Change/update everything applicable.
4. Compile it to a .mo file (this can be done from inside poedit with File → Compile to MO), saved in the same folder.
5. Inside your settings.py, add a line with the following content:

LOCALE_PATHS = ['locale']

That's it! The strings will be shown next time you start oTree - including in Heroku (remember to git add and git commit the django.mo file).