Issue Summary

When locking a file from the source view the button doesn't updates to unlock

Steps to Reproduce

1. Create a repository with a `.gitattributes` file with content `*.png filter=lfs diff=lfs merge=lfs -text`
2. Add a `.png` file to the repo
3. Navigate to the png file using the file browser and go to the source view for that file
4. click on the "Lock button" - notice the button doesn't change to "Unlock"
5. Refresh the page - Now the button will be "Unlock"
6. Click on "Unlock"

Expected Results

• the button should toggle between Lock/Unlock when the action is done
• the frontend shouldn't crash when unlocking a file

Actual Results

• The button doesn't toggle between Lock/Unlock
• The frontend crashes after Unlocking a file

Workaround

Refreshing the browser fixes this issue