Today I found a nice Visual Studio Extension for working with localization and resx files: Resx Resource Manager. This extension provides an additional view in your project and scans all the resx files. I would recommend it to all projects where you have to translate your interface. Here is how it looks in my project:
It can also assist with some machine translation from Bing and MyMemory:
Another good thing is the Export and Import to and from Excel. Wonderful if you need help from Non-developers.