Before you start translating the resources we advise you to copy the whole localization solution to your custom location: from "MonoX/Samples/Solution/LocalizationSolution" to "YourCustomFolder/LocalizationSolution" (out of the MonoX CMS folder structure).
New versions of the MonoX CMS that you may upgrade to in the future will overwrite the localization solution folder with the new MonoX resources, and that is why we advise you to copy the whole localization soultion to your custom, protected location. When you do so please open "YourCustomFolder/LocalizationSolution/LocalizationSolution.sln" in the Visual Studio. You can open RESX files and translate the resources as usual.
When you change some resources, build your Localization solution and copy all the files from it's bin folder to the MonoX portal bin folder. You can change the language in portal administration area while logged in as an admin(Please t ake a look at the attached image).