-Get the French or English language strings from your steam install directory:
“%steamapps%\common\Demelia Isle\Demelia_s_Isle_Data\StreamingAssets\Langages”

-Rename the files replacing "EN" or “FR” by your language 2 letter ISO code.
In every json file:
"str_language": "your language",
"str_languageby": "your name/pseudo",
These parameters must not exceed 12 characters and must be strictly the same in each of your language files.

-Make sure you save the *. json as UTF8

-Put the files in:
“%steamapps%\common\Demelia Isle\Demelia_s_Isle_Data\StreamingAssets\Langages”

-Now the new language should appear in the settings menu. (Need to restart the game)

If you have already launched the Steam Workshop Uploader from the game menu, all the configuration folders were automatically created.

Create folder Documents/DemeliasIsle/WorkshopUpload/content and place the files you want to upload in it. (This is case sensitive, make sure to name the folders exactly as indicated).
Place preview image at Documents/DemeliasIsle/WorkshopUpload/thumbnail/preview.png
This must be a 640x360 PNG image less than 1Mo.

Launch Demelia’s Isle, and in the main title screen click on Workshop Uploader Icon.
Type title and description and click Upload.
A new window will open, allow time for the upload to take place. When the log text turns green, it means that the operation has finished correctly.

Items are uploaded in private mode. You need to go to the workshop page for the item on the steam website and change the visibility to public.
We highly recommend that you add some screenshots for your item, you can also do this from the workshop page for your item.

Updating Items
When you upload a new item, Steam will assign it a new ID. The Workshop Uploader will automatically remember the ID from the last item you have uploaded.

All upload parameters are automatically saved in Documents/DemeliasIsle/WorkshopUpload/config folder and set it automatically.

However if for some reason you want to update a different item, or you lose the ID, you can always get it from the URL of the item page on the Steam Workshop and edit ConfigUpload.json.
If you want to create a new item, remove the *.json files in the Documents/DemeliasIsle/WorkshopUpload/config folder.