Translations:Help:Extension:Translate/Off-line translation/11/en

There is no need to translate the file completely. Uploading partially translated message groups is perfectly fine. There are two ways to import these files.

The users with correct user rights can use Special:ImportTranslations to upload and import the translations. The special page processes the file, shows the changes and lets the user import them. For large files with lots of changes the importing might take multiple steps, as the processing time is limited.