Translation context for strings

Very often translators cannot do job well because they don't know context (just where this string placed in the application) even if he lauch application it could be hard to find exactly this string and takes time. It would be great if there is a way to add a string context for translators. Just one comment per string in main language.
This field may be placed below the string identificator, and may be empty.
To add this context we can use "edit" button.

Thank you