Yes, it is possible to add a new language to existing textbases and the following would explain the process
(Important note, you would need to have Multitrans client Admin rights to create and append documents to the textbase that you need to add a new language)From your Multitrans client:
- Click the "Build Textbase" button
- Select (leave default) "Unilingual documents" and select the "Append to existing Textbase" option at the bottom
- At "Step 2" select any new unselected languages you would like to add to the textbase as shown below, click on "Next" and continue the rest of the wizard as usual
- Once the Build\Append process is completed, start a new session, select the textbase and confirm if you can select the new language (source or target)