You can view our master localization csv sheet here:
https://drive.google.com/open?id=1iFsgGlDymkxwxxbHmh_vLW37Qo9TnZQQMCrAybKjj9U

We would suggest the easiest way to create and maintain a new asset is to duplicate our sheet to your own Google Sheets account and use that to create your own asset:

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Once you have your own copy of the localization sheet you can go to work translating the fields...

Important! Be sure not to mess up the placement or count of any {0} {1} [PLATFORM] or similar terms inside texts as these are parsed by the game in set way!

Tip! Google Sheets has some translation plugins that could be used to auto-translate some text...

Once you have completed translating all the terms in your sheet, export the file as a csv.

As it's possible for multiple workshop items to share the same name you will need to set the csv file name to a distinguishable display name, ie: elvish.csv, straya.csv, TheLegend69s_CoolLanguage.csv.

Important! Please do not use the -DEFAULT suffix in your file names, ie: it-DEFAULT, fr-DEFAULT, etc. This is reserved for our official translations.

Once complete, use the Stranded Deep Workshop Tool to upload your new assets.
https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=1869733832
Important! All localization assets need to be published with the ‘Localization’ tag!

Subscribe to your new localization asset and it should be available to use under General->Language in the game settings.

As we update any terms and texts you will also need to maintain your localization asset. You can view the version history of our csv to see any new changes and update the respective fields in your own asset.