One task I do quite often is to change single strings in all languages to adapt to changes in my app.
Currently I have to open every language supported on it's own, search for the string, change it and save and approve it. This becomes quite time consuming and boring even with the 12 languages I support now, let alone for somebody featuring more languages.
Suggestion: Introduce the option to search for a key and edit the localized strings for it on one page, including approval. This should probably only be possible for the project owner, not members.
For a single developer like me who translates most languages on his own this would be a great functionality to cut down time spent on localization.