Is there a way to change some translations by simply replacing a file like i18? Without actually changing the file and recompiling?
If you want to test translation, you can change translation textfile at i18n directory:
When testing translations, you can start Wekan at cloned git repo with commands:
cd wekan meteor
Then when you make changes to textfile, webpage at http://localhost:3000 will automatically refresh with changes.
To actually contribute translations to Wekan, use Transifex:
Only English language additions are done with pull requests to wekan/i18n/en.i18n.json file when adding new features.