If it's not too much content you can create a scriptableObject and add all the variables you need to translate, after that you just create an instance of the scriptable object in the project for each language and you can later on switch it as a reference.
If it's more complicated you can also do it that way but then a bit more generic using keys and other things like importing from XML, JSON or CSV files into the structure. If you don't want to deal with all of that I suggest finding an already made solution in the Asset store. There are many out there and are all pretty useful, I myself have one in the store which I think it's very straightforward.
Check it out if you are interested!
[Gamestrap Localization][1]
[1]: https://www.assetstore.unity3d.com/en/#!/content/72415
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