Lint Error Checking tool that comes with Android Developer Tools has an optional setting for missing translations:
You can require all regions to provide a full translation by setting the environment variable ANDROID_LINT_COMPLETE_REGIONS.
I tried setting this environment variable in Mac OS X Snow Leopard following this answer, but I still can't see missing translations among Lint Warnings. It only works if I run it through Terminal.
How can I verify if an environment variable is visible within Eclipse? Are there any Android developers who got this working on Mac OS X, or is this an ADT bug?