Editing contributed strings sets wrong version

As a language pack maintainer I was reviewing a contributed translation for version 3.7. I've spotted an error and clicked the Edit button to edit a contributed string. In translator the DEV version string was displayed. I've edited the string and back in stage there are now two versions of the string: unedited string for version 3.7 and edited string for DEV version. After committing the contribution the DEV version contains edited string and 3.7 version contains unedited string.