Create resource files for ASP.NET web site to allow multi-language (NO translation required)

I have an ASP.NET web site that has been developed over a 10 year period. The web pages all have label and message test "hardcoded" in the aspx. There are approximately 60 pages or controls varying in complexity from a simple "login" page to one or two with 50+ labels. I need all the text to be extracted to a resource file and the pages changed to load the strings from there instead. My client will be creating additional resource files for the 9+ additional languages that are to be supported. I can provide a sample web page to interested developers but will require you to enter a non-disclosure agreement first. At this stage I am looking for expressions of interest and a costing. My client needs to approve the project before development can begin, but it the usual story that, once approved, they will require completion as soon as possible.