By popular demand, we released hard-coded text support as part of this announcement.
We support React, Angular, and Vue. We are working to improve the user experience for editing hard-coded so there is more context of where the text is in the code (and UI).
The environment is selected when a repo is connected but can be changed in your settings as well. Typically customers are making changes to the development environment. We treat content as a feature with a PR to the [development] environment for each content change.
*Branch-based changes are not yet supported but is in the roadmap.