Are there solutions/tutorials/open source solutions to providing the functionality of having Content Editors edit ASP.net Localization files?
For example,
With Labels.resx and Labels.fr.resx, it would be great if theres an editor out there that allows End Users to end the content of the file.
I would suggest a database solution with caching. I found this article which might help. It has a complete provider along with a very good write up.
Creating a Data Driven ASP.NET Localization Resource Provider and Editor
http://www.west-wind.com/presentations/wwDbResourceProvider/
Particular bit to note: