What You Will Need
Step 1 - Click the flag icon
After logging in, click on the "Flag Icon" in the top right corner. The flag you see represents the current Transcription Language.

Step 2 - Default Language dropdown
From the Transcriptions Language page, open the "Default Language" dropdown and select your new Transcription Language.

Step 3 - Save your new language
Click "Save Language" once you select the desired language.

NOTE: The new language choice will only reflect on future uploads.
What You Can Do Now
Add to your Custom Vocabulary
Configure your Player settings
Edit some Transcriptions