we use {} as a placeholder inside strings. However, during translating, when I try to enter them using the keyboard, nothing gets entered in the text area.
Copying the source string that contains the curly braces is the only thing that works.
Would you mind sending us the link to the specific string you tested to give it another go?
Feel free to share link and string details to support@transifex.com. Include any relative information such as browser, OS, etc…