How to upload a translation file to your Tiki
1. Download translation file from Transifex
Select the Tiki version and language file at https://www.transifex.com/tiki/
2. Upload translation file to your Tiki
With a user that has proper permissions (tiki_p_edit_languages) go to the i18n control panel, select "Upload Translation"
Than select language, "Transifex php" file type, attach the file and select "Upload"
If upload is successful, you will see a feedback