Best pattern for labels on website based on client profile

I have a requirement to make our current web application configurable based on client profile. So basically, allowing the application to scale and customize itself based on who the customer is. My current requirement to start off with will be simple, which is to make text within the web application configurable. So ATM, there will be 2 possible profiles, and based on which profile you select (either through AppSetting or database), all labels need to render accordingly. I can think of many ways of doing this. One thing I don't want to do is storing the label values in a database table because ATM there is no requirement to modify the labels through an interface, so I was thinking perhaps Resource files?

Also, my next requirement will be to all features within the website to be turned on/off based on profile, so I Need to keep this into consideration. Sometimes a feature will share 90% of the logic, so it wouldnt be feasible to duplicate to the feature and make the 10% changes for that profile and then have 2 copies of the same feature with minimum differences. So I'm looking for a solution for this as well. Perhaps an overall design that would cover both requirements?

Any advice will be highly appreciated. Thanks