First of all, thanks for a nice product!
To make the application convenient I'd like to suggest a few enhancements:
1. Add button "X" to each tab to close it quckly.
2. Add sorting file groups in the tree by path (now it is sorted by file name). It could be useful to find files located in the same folder.
3. Add a background color to rows with the the same text in all languages to find not translated records. It could be turned on/off from configuration.
4. Edit project settings -> Settings tab: misleading labels: "Name" for the project location and "Location" for prokect name.
5. When editing resources for the entire project in the single tab there is no way to find what res group the selected record belongs to.
Hope you will have time to address my suggestions in the next releases.
Mike