The localisation features are a little bit "hidden"
While programming an app for different languages, I often have to open the localisation window. There are a lot of clicks to get to the window, where I can add/change the strings.
Proposed Solution
I did a little mockup as a suggestion. It would be easier to remove the "Supported locales" from the Project settings and put them under the "Solution" tab. The "Localisation" tab from the Project settings window shouldn't also not to be shown there. On the right, there could be a row with "[L] Localisation", when double-clicked a window with the localisation configuration opens.

Who Would This Help?
Everyone, who has to translate her/his app.