Searching around a bit, I found a several resources about string localization and layout that might be helpful:
- 12 Commandments of Software Localization (Smashing Magazine)
- Internationalizing Your Code (Apple iOS developer doc)
- Internationalization and Localization Guide (Apple OS X developer doc)
- Adobe blog posts tagged as 'localization'
- Localization Checklist (Android)
- Making your Winforms application Global (Microsoft)
- String-Related Issues (Microsoft)