Transifex - How add new language string

Hello. I joined the transifex translator team and would like to help with the translation.
I couldn’t fully understand how the transifex works. I’m trying to add a new string. The new currency used in the Czech Republic in file dict.lang.

I proceed by selecting the Project name “Dolibarr ERP & CRM software” - “Resources” - to filter “dict” - to lang filter “czech” in the Transifex on the left. After displaying the window, select “Download file to translate” and manually insert this string into the file and upload the file to the server again.
When I repeat the procedure to check if the change has taken effect, I find that a new string has not been added.

Is there anything else I need to do to make a change?
And is there a way to download the whole language package, which I would edit in a text editor and upload to the server again and the change took effect?